Both http://support.microsoft.com/kb/q253912/ , http://support.microsoft.com/?kbid=296773 and other articles point to issues with this old OS and large amounts of memory.
No fix was supplied and its found that keeping the machines at 512MB or less helps.
Good luck with this.
I'm using a P4 chip w/ over 768 ram. My pc seems to work just fine while I'm using it. The wierd part is if I leave it on and walk away, come back say an hour later it freezes. Sometimes I get the "Dangerously low resources" message. Usually though I will get a slieght movement of my mouse then it all freezes and I have to reboot. I'm not playing games or anything particularly demanding. It just seems if it's going to freeze it would do so when I'm using it...not when I come back to it! Any ideas!? Thanks!