I'm sorry but this is not enough information to get focused help. You've
told us nothing about your friend's computer, what s/he is doing when the
lockup happens, or the full exact text of the error message. These links
will show you what details you need to include to get the help you want:
http://www.elephantboycomputers.com/page2.html#Usenet
http://support.microsoft.com/default.aspx/kb/555375 - How to Ask a Question
Malke
--
MS-MVP
Elephant Boy Computers - Don't Panic!
FAQ -
http://www.elephantboycomputers.com/#FAQ
searched google"ac error "and found the fix myself,all related toAOL