Hmm...I don't exactly know what to tell you...go to window's update and scan for updates to your version of Windows, and download the most crucial files, if it doesn't get solved with that then I'm with bkk, you will have to save your programs on a back-up disk and then reformat your hard drive then re-install your operating system. then you'd have to put all your olds programs back on to your computer, it may take a while, but that should fix the problem.