Do you know when this problem began? Try a System Restore to a point in timeBEFORE the problem began. Here's the procedure:
http://www.howtogeek.com/howto/windows-vista/using-windows-vista-system-restore/. Be sure to
check the box to show more than 5 days of restore points. If the first attempt fails, then try an earlier point or two. NOTE: You will have to re-install any software and updates you installed between now and the restore point, but you can use Windows Update
for the updates. Use the recovery disk if the system prompt doesn’t work. The recovery disk works a bit different from the above procedures but if you follow the prompts from the System Restore menu option with the above information you should be able to
restore with no problems.
I hope this helps.
Lorien - MCSE/MCSA/Network+/A+ --- If this post helps to resolve your issue, please click the "Mark as Answer" or "Helpful" button at the top of this message. By marking a post as Answered, or Helpful you help others find the answer faster.