<< I`m using VIA board (infact 2 with no problems with gaming),anyway on my WinXP one what I did was install latest drivers,I would suggest you go into bios disable all video shadowing,disable system bios cacheable,set AGP aperture size to 64mb or 128mb,disable fastwrites,my ram is set to turbo which works fine you can try slower speed settings like fast,normal etc which might improve game stability..
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I never tried the video shadowing idea, i'll do it though.
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The VIA 4 in 1 drivers(4.38a) and VIA USB filter driver 1.10 are optional if you want to install them,I did on mine and WinXP eats anything I throw at it for breakfast(rock stable even with USB devices),I`m using the Nvidia 28.32 drivers which are excellent IMHO.
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I'll try to 4.38a dirvers, also. What if i went back to 4.1? I did upgrade to 28.32 before but the stability issue was not fixed.
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Lockups could be IRQ conflict even with 2K/XP,I always leave PCI slot 1 empty(nearest to AGP slot) even with 2K/XP systems.You don`t say what soundcard you`re using.
Hope this helps,yes I`m a hardcore gamer 😉. >>
Slot one is empty, i actually have a slot cooling fan in there, pulling heat off the geforce.
BTW, i'm using SB Live plat. 5.1. Yes, i have installed the unholy trinity of hardware conflicts 😉