Framework 3.5 problem

Hello! I am having trouble with 3.5, and dell datasafe. I installed some private server programs, then uninstalled them after. This messed up these 2 programs. I did a system restore, this didn't fix it. I am currently trying to reinstall 3.5. When I do, it says I need to turn windows features off. I try to turn off the uninstalled framework in windows features, and it says unable to. Machine.config file is giving me errors during startup for dell datasafe. Any idea how to rectify this problems? They are very very aggravating, have been toying with it for hours now. Any help would be GREATLY appreciated!! Thank you

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