It does not state a definition. When I get the error, it states that if it is the first time I have received this message, try rebooting. If it continues, which it has, try uninstalling any recently installed hardware. I have not installed any new hardware recently. For about a week now, I have been having multiple issues. When logging on, the start menu does not appear at the bottom of the screen sometimes and then recently, system would not boot up at all. I also get messages that memory is low, not enough quota to open a program (???). Now I am wondering if it is best to just try to reinstall windows xp.