Make sure to go to Microsoft update, if you need any updates for .net, they will be offered in the updates
Another thing I would suggest before reinstalling
-Uninstall first
After unisntalled, download and run
Windows Installer Cleanup
This should help
Download windows installer cleanup, open app and go down list till you see Any MS Office Related Software and hightlight then click remove, this will remove any installer info left behind by programs removed from system.
http://download.microsoft.com/downlo...bd/msicuu2.exe
So,
-Unisntall
-use tool above
-update or you can download the .net separately and install from your hard drive
Then try to give install another try