Problem csc.exe zły obraz

,, Since from Windows Vista, .NET Framework is included in Windows as system components, if you are using these systems(Windows Vista/Server 2008/7), you'll need to go to Control Panel -> Programs and features -> Turn Windows features on or off -> unselect Microsoft .NET Framework 3.X and its sub items -> OK. Then reopen Turn Windows features on or off window, select Microsoft .NET Framework 3.X and its sub items -> OK. ,,

Co dokładnie mam odznaczyć/zaznaczyć sam folder z NET Framework czy coś jeszcze ? Może reinstall systemu pomoże ?