Holy cow! I'd say you have every thing going on with that PC. The errors are the worst when it comes to trouble shooting (ram,cpu,PCI hardware,drivers,IRQ's,software), if it were just one of the errors then maybe not so bad.

Conan gives the best advice, if you haven't done so then format and install XP Pro fresh and not upgrade over the top XP Home.

Make sure your not overclocking