I have an error message saying file or directory C:\WINDOWS\Prefetch is \ncorrupt or unreadable. The error bubble prompted me to run the Chdsk \nUtility. The Chdsk Utility cleaned it up but when it gets to stage 5 there \nis an error and it stops. I have run a full virus scan twice and no virus \nappears. How do I correct these problems? Thx.