Archen

I've been having a very strange problem. Every time I am in either Beregost or Nashkel, my computer just randomly reboots. No errors, no warnings, nothing. It doesn't do this in the other areas I've been to, although I haven't gotten far in the game. It's very annoying because I'll be in either of the cities and 15 seconds later my computer reboots automatically. It only happens outside of these cities, not in buildings, and it happens if I am in dialog with someone, or not. It's really weird because it is totally random. It's happened about twenty times already. I have an athlon xp 2000, 512 ram, and it never does this when I run any other applications. It seems like my computer hates the taste of Bp-BGT-NEj. I've also tried CTRL-ALT-DELETE and close all the processes that aren't Win XP related, like Avast Antivirus.
Any ideas on what may be the problem? Any ideas on what tweaks I may try?
I have all compatible mods installed, and haven't encountered any bugs in my game so far, so I don't think it's bug related. It seems unlikely my install is bad... but who knows?

I sure hope I can fix this, else I'll have to try the dreaded reinstall of this monster-mod.