Is your BIOS time correct?
Yes...a weak, failing, dead CMOS battery can cause any number of difficult situations, the most easily recognizable being inaccurate system clock and file datestamps.
The first time I paid attention to this...I had done a clean install because of some issues that didn't make sense and upon reboot I noticed that my file creation times reflected a year before XP was ever released
. The cause of my problems suddenly became clear, corrected by a $2.95 purchase at WalMart.
CMOS Battery Replacement - http://www.liverepair.com/encyclopedia/art...cmosreplace.asp
Ignore the part about writing down settings, totally unnecessary these days.