Locks Up

[Ayman Altounji]

My systems hangs about 15 minutes into any session. I must them do a hard shutdown to turn it off.
When I initially purchased the machine I had this problem (about 2 years ago) and had to either modify or download something from the Compaq support forum. I recently did a selective restore to the original configuration and the problem seems to have resurfaced. Does anyone recall the fix or have any ideas?
Your response would be greatly appreciated, thanks very much.