|See if you can setup up dump logs and view them. |
Might have to setup a performance monitor log to see if you can find out memory leaks.
Might have to get more detailed system diag suite.
Might have to look at bios setting for timings.
See also any cold joints on motherboard.
This is a very hard thing to find sometimes.
There used to be an issue with xp64 and some amd's but I think they fixed that. I doubt the phenom had that issue but maybe look at version level. Might have an old one.
"Best Practices", Event viewer, host file, perfmon, antivirus, anti-spyware, Live CD's, backups, Make an autorun.inf folder on all usb drives.