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Error: Code 3664 - An asynchronous OpenConnection call is not yet complete; you cannot yet reference the returned connection object until it is complete.


How to fix the Runtime Code 3664 Microsoft Access Error 3664

This article features error number Code 3664, commonly known as Microsoft Access Error 3664 described as An asynchronous OpenConnection call is not yet complete; you cannot yet reference the returned connection object until it is complete.


About Runtime Code 3664

Runtime Code 3664 happens when Microsoft Access fails or crashes whilst it's running, hence its name. It doesn't necessarily mean that the code was corrupt in some way, but just that it did not work during its run-time. This kind of error will appear as an annoying notification on your screen unless handled and corrected. Here are symptoms, causes and ways to troubleshoot the problem.


Definitions (Beta)

Here we list some definitions for the words contained in your error, in an attempt to help you understand your problem. This is a work in progress, so sometimes we might define the word incorrectly, so feel free to skip this section!

  • Access - DO NOT USE this tag for Microsoft Access, use [ms-access] instead
  • Asynchronous - Asynchronous programming is a strategy for deferring operations with high latency or low priority, usually in an attempt to improve performance, responsiveness, and or composability of software
  • Call - A Call is the action of invoking a subroutine of code, an external program or a script in a programming environment
  • Connection - Refers to a connection used to transfer data between two endpoints, such as between a client and a web, database, web service or other server.
  • Object - An object is any entity that can be manipulated by commands in a programming language
  • Reference - A reference is a value that enables a program to indirectly access a particular datum, such as a variable or a record, in the computer's memory or in some other storage device.
  • Access - Microsoft Access, also known as Microsoft Office Access, is a database management system from Microsoft that commonly combines the relational Microsoft JetACE Database Engine with a graphical user interface and software-development tools
  • Microsoft access - Microsoft Access, also known as Microsoft Office Access, is a database management system from Microsoft that commonly combines the relational Microsoft JetACE Database Engine with a graphical user interface and software-development tools

Symptoms of Code 3664 - Microsoft Access Error 3664

Runtime errors happen without warning. The error message can come up the screen anytime Microsoft Access is run. In fact, the error message or some other dialogue box can come up again and again if not addressed early on.

There may be instances of files deletion or new files appearing. Though this symptom is largely due to virus infection, it can be attributed as a symptom for runtime error, as virus infection is one of the causes for runtime error. User may also experience a sudden drop in internet connection speed, yet again, this is not always the case.


Fix Microsoft Access Error 3664 (Error Code 3664)
(For illustrative purposes only)



Causes of Microsoft Access Error 3664 - Code 3664

During software design, programmers code anticipating the occurrence of errors. However, there are no perfect designs, as errors can be expected even with the best program design. Glitches can happen during runtime if a certain error is not experienced and addressed during design and testing.

Runtime errors are generally caused by incompatible programs running at the same time. It may also occur because of memory problem, a bad graphics driver or virus infection. Whatever the case may be, the problem must be resolved immediately to avoid further problems. Here are ways to remedy the error.


Repair Methods

Runtime errors may be annoying and persistent, but it is not totally hopeless, repairs are available. Here are ways to do it.

If a repair method works for you, please click the upvote button to the left of the answer, this will let other users know which repair method is currently working the best.

Please note: Neither ErrorVault.com nor it's writers claim responsibility for the results of the actions taken from employing any of the repair methods listed on this page - you complete these steps at your own risk.

When you get a runtime error, keep in mind that it is happening due to programs that are conflicting with each other. The first thing you can do to resolve the problem is to stop these conflicting programs.
  • Open Task Manager by clicking Ctrl-Alt-Del at the same time. This will let you see the list of programs currently running.
  • Go to the Processes tab and stop the programs one by one by highlighting each program and clicking the End Process buttom.
  • You will need to observe if the error message will reoccur each time you stop a process.
  • Once you get to identify which program is causing the error, you may go ahead with the next troubleshooting step, reinstalling the application.
Using Control Panel
  • For Windows 7, click the Start Button, then click Control panel, then Uninstall a program
  • For Windows 8, click the Start Button, then scroll down and click More Settings, then click Control panel > Uninstall a program.
  • For Windows 10, just type Control Panel on the search box and click the result, then click Uninstall a program
  • Once inside Programs and Features, click the problem program and click Update or Uninstall.
  • If you chose to update, then you will just need to follow the prompt to complete the process, however if you chose to Uninstall, you will follow the prompt to uninstall and then re-download or use the application's installation disk to reinstall the program.
Using Other Methods
  • For Windows 7, you may find the list of all installed programs when you click Start and scroll your mouse over the list that appear on the tab. You may see on that list utility for uninstalling the program. You may go ahead and uninstall using utilities available in this tab.
  • For Windows 10, you may click Start, then Settings, then choose Apps.
  • Scroll down to see the list of Apps and features installed in your computer.
  • Click the Program which is causing the runtime error, then you may choose to uninstall or click Advanced options to reset the application.
Virus infection causing runtime error on your computer must immediately be prevented, quarantined or deleted. Make sure you update your virus program and run a thorough scan of the computer or, run Windows update so you can get the latest virus definition and fix.
You might be getting the error because of an update, like the MS Visual C++ package which might not be installed properly or completely. What you can do then is to uninstall the current package and install a fresh copy.
  • Uninstall the package by going to Programs and Features, find and highlight the Microsoft Visual C++ Redistributable Package.
  • Click Uninstall on top of the list, and when it is done, reboot your computer.
  • Download the latest redistributable package from Microsoft then install it.
You might also be experiencing runtime error because of a very low free space on your computer.
  • You should consider backing up your files and freeing up space on your hard drive
  • You can also clear your cache and reboot your computer
  • You can also run Disk Cleanup, open your explorer window and right click your main directory (this is usually C: )
  • Click Properties and then click Disk Cleanup
If the error is related to a bad graphics driver, then you may do the following:
  • Open your Device Manager, locate the graphics driver
  • Right click the video card driver then click uninstall, then restart your computer
If the error you are getting is related to the Internet Explorer, you may do the following:
  1. Reset your browser.
    • For Windows 7, you may click Start, go to Control Panel, then click Internet Options on the left side. Then you can click Advanced tab then click the Reset button.
    • For Windows 8 and 10, you may click search and type Internet Options, then go to Advanced tab and click Reset.
  2. Disable script debugging and error notifications.
    • On the same Internet Options window, you may go to Advanced tab and look for Disable script debugging
    • Put a check mark on the radio button
    • At the same time, uncheck the "Display a Notification about every Script Error" item and then click Apply and OK, then reboot your computer.
If these quick fixes do not work, you can always backup files and run repair reinstall on your computer. However, you can do that later when the solutions listed here did not do the job.
Other languages:

Wie beheben Fehler 3664 (Microsoft Access-Fehler 3664) - Ein asynchroner OpenConnection-Aufruf ist noch nicht abgeschlossen; Sie können noch nicht auf das zurückgegebene Verbindungsobjekt verweisen, bis es vollständig ist.
Come fissare Errore 3664 (Errore di Microsoft Access 3664) - Una chiamata OpenConnection asincrona non è ancora completa; non è ancora possibile fare riferimento all'oggetto connessione restituito finché non è completo.
Hoe maak je Fout 3664 (Microsoft Access-fout 3664) - Een asynchrone OpenConnection-oproep is nog niet voltooid; u kunt nog niet verwijzen naar het geretourneerde verbindingsobject totdat het is voltooid.
Comment réparer Erreur 3664 (Erreur d'accès Microsoft 3664) - Un appel OpenConnection asynchrone n'est pas encore terminé ; vous ne pouvez pas encore référencer l'objet de connexion renvoyé tant qu'il n'est pas terminé.
어떻게 고치는 지 오류 3664 (마이크로소프트 액세스 오류 3664) - 비동기 OpenConnection 호출이 아직 완료되지 않았습니다. 완료될 때까지 반환된 연결 개체를 아직 참조할 수 없습니다.
Como corrigir o Erro 3664 (Erro 3664 do Microsoft Access) - Uma chamada OpenConnection assíncrona ainda não foi concluída; você ainda não pode fazer referência ao objeto de conexão retornado até que ele seja concluído.
Hur man åtgärdar Fel 3664 (Microsoft Access Error 3664) - Ett asynkron OpenConnection -samtal är ännu inte klart; du kan inte referera till det returnerade anslutningsobjektet förrän det är klart.
Как исправить Ошибка 3664 (Ошибка Microsoft Access 3664) - Асинхронный вызов OpenConnection еще не завершен; вы еще не можете ссылаться на возвращенный объект подключения, пока он не будет завершен.
Jak naprawić Błąd 3664 (Błąd Microsoft Access 3664) - Asynchroniczne wywołanie OpenConnection nie zostało jeszcze zakończone; nie można jeszcze odwołać się do zwróconego obiektu połączenia, dopóki nie zostanie on ukończony.
Cómo arreglar Error 3664 (Error de Microsoft Access 3664) - Una llamada asincrónica de OpenConnection aún no está completa; todavía no puede hacer referencia al objeto de conexión devuelto hasta que esté completo.




The Author About The Author: Phil Hart has been a Microsoft Community Contributor since 2010. With a current point score over 100,000, they've contributed more than 3000 answers in the Microsoft Support forums and have created almost 200 new help articles in the Technet Wiki.


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