Frequent "you must restart your computer" crashes.

[merrinn]

Greetings all, hopefully I can find an answer to my problem here.

I am fairly new to this, but I did have a fully working 10.4.8 install going for a couple weeks with no issues, and decided to try 10.5.2

The install went through with no problems at all on a fresh partition. Everything seems to work fine once I boot up, but I am constantly getting the multi-language "You must restart your computer" screen of death. The computer will be running fine for anywhere from 5-30 minutes before the crash happens, but it happens every time.

Specs:
eVGA 133-K8-NF41-AX (Nforce4)
Athlon 3700+
eVGA GeForce 7800 GT
1.5GB PC3200
Onboard LAN
Not sure what other specs would be necessary to know...

I tried with the 9.2.0 kernel first, then formatted, reinstalled with the 9.1.0 kernel and am having the same issues.

If anyone has any ideas I would appreciate it!