Net framework has multiple versions, all of which are installed individually, so make sure you have all of them, .netframe work 1, 1.2?, 2,3, 3.5, and 4.
maybe you only have the 4th installed, you will need previous versions also!
otherwise if that does not work, uninstall them all and reinstall them all as it seems they are corrupted, if still nothing reply back for more feedback or try reformatting your pc
Joseph B. Visscher - JBV3737
Bugs aren't the problem, figuring out how to fix them is.