If you did not get the last Windows update installed you most likely have the Sasser worm. Check out this thread.
hi, my unit is a p3 1.5 ghz, winxp pro, 256mb ram! one night while im surfing a message pop-up that said "LSA shell 'Export Version' has encountered a problem and needs to close" then asks me if i will send an error report to microsoft or not, when i select no then a 60sec countdown system shutdown will be executed that will automatically restart my unit after the 60sec countdown! i tried to cancel it but it can't be close! it happens everytime i go online! is this a virus? how can i fix this? please help! thanks!