JAESK 0 Newbie Poster

Hi..I'm new to this board, and tried to search to see if there was a thread regarding this issue, but was unsuccessful. Lately, I've been receiving the error message above. This message appears after tooling around on the internet (IE) or getting email. It does not appear on boot. Once the message is received, the system is virtually functionless, i.e., I have to reboot. I'm still running the XP Home Edition (have not loaded the SP2) which came with my DELL computer 3 years ago. I have loaded the updates until the SP2 one. I've checked for viruses (none), SPYWARE (got rid of all), cleaned the IE cache and temp files. I'm stumped. Anyone have a clue?