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Try rebooting into Safe Mode by tapping F8 repeatedly while booting up and then invoking System Restore either by going to it in the Start Menu > All Programs > Accessories > System Tools or go to Start > Run and type in rstrui.exe and click OK or the Enter key, or simply type rstrui in the Start > Search box and selecting it from the box above.
Go back to before this happened but if successful don't forget to update both Windows and McAfee.
This should be Vista SP2 and your Internet Explorer should be upgraded to version 9 a.s.a.p. once this problem is sorted out. If you don't have SP2 then read here: https://community.mcafee.com/thread/2019
K this helped but now when I scan it tells me that mcafee has to restart to update to adress a type of virus, but when it restarts my computer wont start up. Can you help me with this?
Then the System Restore wasn't successful. Is there another restore point, earlier perhaps?
See this thread where someone else reported the same problem. That user had a corrupted McAfee installation and you probably have the same. You'll need to re-install McAfee, following the instructions Ex_Brit gave there.
If you encounter difficulties during the start-up process your PC may have another problem unrelated to this one. Can you get into Safe Mode with Networking? Try doing the uninstall/reinstall from there.