I've got autocad LT 2002 on the machine at home so that I can do the odd bit of homework. Every few minutes it comes up with a fatal error message then shuts a'cad down. Recovery doc. is made and shows no errors. Now I've had the machine rebuilt whit lots of new parts, re-installed a'cad and now it just shuts the whole computer down. No recovery doc, nothing. I've de fraged and re-installed twice, no improvement. Any ideas?