I am running Windows XP and after downloading service pack 3 I have not been able to access the control panel, My Computer, My Pictures, etc. When I right click on Start and then left click on "Explore" I get an error message and cannot drill down. I run Trend Micro Security Pro as virus protection. I have used System Restore to go back to an earlier configuration but the problem persists. After reading threads here at daniweb I have downloaded Spybot and have run that and have cleaned up a few viruses. I have downloaded Hijack This and have run that as well. Can anyone offer some help ?