I ALWAYS RECEIVE A MESSAGE THAT READS 637855CE.EXE APPLICATION ERROR,THAT THE SYSTEM WILL SHUT DOWN AFTER 60 SECONDS AND THE SECOND MESSAGE READS MEMORY CAN NOT BE WRITTEN
MAYBE IT IS TIRED OF YOU SHOUTING AT IT!! Try not using CAPS.
Outside of that, what was the last thing that was done to the computer before that error started coming up. That might be a good place to start. More information would be nice.