Hello and welcome to the forum.
We will need to have some idea of what the "error message / pop-up" is actually saying.
If possible, use the built-in windows snipping tool to take a snapshot of the error and attach it to your next post.
Alternately perhaps you could type the content (text) as well as the information in the title bar of the error message into your next post.
Keep us posted
Open the Control panel (icon view) and select Programs and features
Select Net framework.
Select "Change" and the repair option.
If this is not sufficient, you may need to totally unistall net frame work. For this you sometimes need to run a specially designed Microsoft uninstaller.
Recently found this tool which helped me overcome a Dot Net corruption issue which was preventing a proper install of the DotNet4 security update which seemed to be in an install loop and never successfully installed. Your specific issue seems to be linked to DotNetFrameWork2 but I can't say for sure. But if you would like to use it I have attached it here for your convenience. I used it myself and it worked for me. After I cleaned up DotNet4 and rebooted, I used Windows Update to reinstall DotNet4 and then the update installed properly after that with no further issue. I hope it helps you as well.
If you find that you do need to remove a particular version of the DotNet Framework (unable to repair it) then this link will help you obtain the version you need to reinstall. http://www.microsoft.com/net/download.aspx
hy...i have exactly the same problem...and i tried to solve it just like u described...but unfortunatley it didn't help...i tried all of those solutions but it's still there...dunno what to do anymore...i even tried to uninstall dotnet but when i open control panel and uninstall program it's not on the list...it was kinda weird because it should be there...so i looked in the program files drectory it was there but there werern't all files that should be there...i have quite exp with PC and i just dunno what to do...i tried literally everything...but nothing...i even tried to delete the dotnet directory and reinstall it but impossible...hope some of u know how to resolve it...