I'd start with a comprehensive malware scan, followed by a memory test if that comes up clean.
I have operating system XP professional.
I have recently loaded my copy of AutocadLt 2002. For about a week it worked fine, but how I have a problem opening Autocad. If I click on the short cut it opens, flashed up the screens, then closed. If I restart the machine 80% of the time I can open Autocad, but when using it, it will suddenly close.
I have reinstalled, and repaired the program. No change. I have booted the system and repaired the autocad from the disk today, it has progressed to 99% but hung up.
Used autocad on another machine with xp no problem for years.
Any idead where thr problem is ?