I have a desktop that has applications failing to open because the .net 2.0 framework is corrupt. I have found instructions on how to fix the 32 bit version. But not the 64 bit version of the framework. Can anyone from Microsoft provide a KB article or instructions on how to fully uninstall the .net framework and re-install it on a 64 bit machine? Or run a repair on the 64 bit based framework? Thanks in advance!

Please see: How to use the System File Checker tool to troubleshoot missing or corrupted system files on Windows Vista or on Windows 7Carey Frisch

Hi, Please refer to the blog below. http://blogs.msdn.com/b/astebner/archive/2007/03/26/how-to-repair-the-net-framework-2-0-and-3-0-on-windows-vista.aspx Juke Chou TechNet Subscriber Support If you are TechNet Subscription user and have any feedback on our support quality, please send your feedbackhere.Juke Chou TechNet Community Support

Hi, Please refer to the blog below. http://blogs.msdn.com/b/astebner/archive/2007/03/26/how-to-repair-the-net-framework-2-0-and-3-0-on-windows-vista.aspx Juke Chou TechNet Subscriber Support If you are TechNet Subscription user and have any feedback on our support quality, please send your feedbackhere.Juke Chou TechNet Community Support

Hi, As the blog says, you have no need to rebuild the system from scratch. Please make an in-place upgrade installation to repair .NET registry corruption. http://support.microsoft.com/kb/2255099 Juke Chou TechNet Community Support

Hi, How is it going? Please feel free to give us any update. Juke Chou TechNet Community Support

No luck yet. "When the scan completes, the SFC tool will indicate whether or not it found any problems and whether or not it was able to fix them" I ran the scan and unfortunately it found nothing: "Windows Resource Protection did not find any integrity violations." The 64 bit 2.0 framework is still corrupt. This system is running Windows 7 x64 not Vista but the measures may have been compatible under similar circumstances. Thanks for the responses. Before I have to re-do the system from scratch are there any other recommendations? It might also be noted a virus was removed prior this issue. The virus was cleaned but it apparently took the framework with it.

Hi, As the blog says, you have no need to rebuild the system from scratch. Please make an in-place upgrade installation to repair .NET registry corruption. http://support.microsoft.com/kb/2255099 Juke Chou TechNet Community Support

Hi, Any luck?Juke Chou TechNet Community Support

I have a page on my IT site off the home page of all of the Visual Studio runtimes including .NET 2 and up I suggest vising that page and install what you need from there Windows MVP 2011-12, XP, Vista, 7. Expanding into Windows Server 2008 R2, SQL Server, SharePoint, Cloud, Virtualization etc. etc. Hardcore Games, Legendary is the only Way to Play Developer | Windows IT | Chess | Economics | Vegan Advocate | PC Reviews

Hi, As this thread has been quiet for a while, we assume that the issue has been resolved. At this time, we will mark it as Answered as the previous steps should be helpful for many similar scenarios. If the issue still persists, please feel free to reply this post directly so we will be notified to follow it up. You can also choose to unmark the answer as you wish. BTW, wed love to hear your feedback about the solution. By sharing your experience you can help other community members facing similar problems. Thanks for your understanding and efforts. Juke Chou TechNet Subscriber Support If you are TechNet Subscription user and have any feedback on our support quality, please send your feedbackhere.Juke Chou TechNet Community Support

Probably a real mess now, probably time for a clean install of Windows. Windows MVP 2011-12, XP, Vista, 7 and 8. Hardcore Games, Legendary is the only Way to Play Developer | Windows IT | Chess | Economics | Vegan Advocate | PC Reviews

I performed the repair install. (Backed up the computer ran the upgrade as the instructions recommended etc.) Did not fix. Framework still corrupt. MS really doesn't have a fix for this do they? I'm amazed. It is that deeply rooted into the system that a repair install won't fix! I ran this test: C:\Windows\Microsoft.NET\Framework\v2.0.50727\csc /? It should return information if the framework were working properly..... It doesn't it just shows a blank line and skips to the command prompt again. The repair install does not work. Thanks for the ideas guys but apparently there is no fix. Back to square one of re-doing the entire system. The .net framework is toast there is no repair for it and I hope anyone in the future looking for how to repair the .net framework (Netfx64.exe is the install source) knows now that it can be corrupted beyond a repair install so that they do not spend hours going through that process like I just did.

Hi, If you run the command mentioned above, CMD will output the options help of CSC.exe command. Based on my understanding, Upgrade installation should fix such issue. Maybe a 3rd party application cause it, please try to boot computer in Clean Boot or Safe Mode and test again.Juke Chou TechNet Community Support