My system restarting again & again, I found in the msconfig shows some items like dumprep0-k, igfxtray, hkcmd

Dumprep is the program to pop up "we have found an error and need to close. Do you want to send an error report to microsoft?" thing.

The others should be there too, both related to graphics in some way.

Are you sure someone hasn't pulled a prank, LIKE THIS (http://www.youtube.com/watch?v=erI0tQNzrbM&feature=related), on you?