[petercj]

Have you run any tests on your drive?

You can find the diagnostic software here:-

http://www.techsupportforum.com/har...s/132450-hard-drive-diagnostic-utilities.html

How about malware scans?

http://www.ewido.net/en/

http://housecall.trendmicro.com/

Try holding your f8 key down from start-up and Last Good Configuration.