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When opening a newly installed program the following error occurs.

The Microsoft Jet database engine cannot open the file C:\Widows32\Win2sys.dll It is already opened exclusively by another user, or you need permission to view its data.

It works fine in Windows XP but not in Windows 7.

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Does the file Win2sys.dll exist? If it does, can you see what company made it? i'm pretty sure it's not something that ships with Windows. – Ian Boyd Mar 2 '10 at 19:20
up vote 2 down vote accepted

win2sys.dll is a Trojan.Dropper-BS. win2sys.dll spreads via open network shares. Related files: %Windows%\csrss.exe %Windows%\win2sys.dll More info: http://www.sophos.com/virusinfo/analyses...

Troj/Dropper-BS is a dropper Trojan for the Windows platform.

When Troj/Dropper-BS is installed the following files are created:

\csrss.exe

\win2sys.dll

The file csrss.exe is detected as Troj/LdPnch-V.

The following registry entry is created to run code exported by the Trojan library on startup:

HKLM\SOFTWARE\Microsoft\Windows\ CurrentVersion\ShellServiceObjectDelayLoad
MStask
(1B978A53-3D5E-4329-8A1A-97FE68699FC7)

The file win2sys.dll is registered as a COM object, creating registry entries under:

HKCR\CLSID\ (1B978A53-3D5E-4329-8A1A-97FE68699FC7)
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I don't think it as virus/trojan. It works for me by changing the Compatibility to "Windows XP" Also another way is suggested here.. http://answers.microsoft.com/en-us/windows/forum/windows_7-windows_programs/windows-7-ultimate-x64-running-programs-as-a/2e61f72d-11dd-4975-bc93-d456ddd7b121?msgId=25383c5a-6b97-4851-b917-fd61752b761a

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Welcome to Super User! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – Mokubai Sep 3 '13 at 10:51

Just open the file location of that application: Right click » Properties » Compatibility. Just change the compatibility to "Windows XP". That's it. That application will run without any error.

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Based on the fact the accepted answer talked about a Trojan, the applicatin in queston was a Trojan, please read all answers before posting such dribble next time. – Ramhound Feb 3 '12 at 18:28

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