NET Framework doesn’t seem to work on Windows 7 Ultimate

Asked By 0 points N/A Posted on -

Hey, guys!

NET Framework is not working on my computer. I have decided to post this question here, because I have not been able to find a solution elsewhere. I have done everything that I could do in order to resolve this issue. I have even followed instructions available online, but nothing has worked. I am trying to install NET Framework on my machine, but it is not working. The operating system on my computer is Windows 7 Ultimate. Any help in this regard will be greatly appreciated. The error code that I am getting is Code 643.

Thanks in advance!

Answered By 0 points N/A #93818

NET Framework doesn’t seem to work on Windows 7 Ultimate


Windows 7(all editions) includes the .NET Framework 3.5.1 as an OS component.  This means you will get the .NET Framework 2.0 SP2, 3.0 SP2 and 3.5 SP1 plus a few post 3.5 SP1 bug fixes.  3.0 SP2 and 3.5 SP1 can be added or removed via the Programs and Features control panel.


i.Click Windows button and type 'regedit' in search bar.

 ii.Click 'regedit' in search results

 iii.Navigate to following registry hive:


Check if following registry keys have correct values:

 ■ MsiExecCA32 should end with Windowssyswow64msiexec.exe

 ■MsiExecCA64 should end with  Windowssystem32msiexec.exe


You may find that the entries are correct but now check the privileges on the key. Set them to read only. Once I changed ownership on the key and made sure the owner had full privileges I was able to install the file downloaded earlier,  As a matter of interest, I had run the various tools to clean up previous installations as well as make sure there were no fingerprints from their installs as well.

Login/Register to Answer

Related Questions