I recently reinstalled and windows says my antivirus needs updated definitions. They are fully updated. Also a weird thing, when i shut down or restart the antivirus kinda stops responding for a second and the end program box comes up for a fraction of a second. I am using symantec, and windows xp pro fully updated. I have tried reinstalling the anti virus 3 times and keeps doing the same thing. I have used it for many years and have never had this problem before. Any help?