Quick tip for solving windows error.
Knock on wood, this has not happened to me in a very, very long time, but every once in a while the Microsoft Windows system files will become corrupted and report errors. The solution to this annoying, but fixable, problem is to repair the files. A reboot of the PC will often do the trick, but there is a way to repair files while Windows 7 is running and, presumably, you are working productively.
http://www.techrepublic.com/blog/window-on-windows/quick-tip-scan-windows-7-system-files-to-repair-errors/3358
Related thread: http://www.techyv.com/questions/errors-trying-use-system-restore-windows-7