Just before we begin, if you have an Ati 9XXX card this tutorial will suit you, as with 8XXX and 7XXX cards, and no doubt the Xxxx series also, it's well worth a try

1. Download the Catalyst 5.5 drivers from the Ati Website (For Windows XP/NT Users):
http://www.ati.com/
2. Download Driver Cleaner 3 from here:
http://www.drivercleaner.net/dc.htm
3. Install Driver Cleaner 3, but do not use it yet.
4. Uninstall the Ati Display drivers using the good old fashioned method (Start-> Control Panel->Add/Remove Programs) Ati Display Driver should be near the top of the list, restart your computer after the installation has finished.
(Your Windows should by now be using only Standard VGA drivers, the resolution maybe a little smaller than usual, do not worry, this is normal. You will also get some 'Windows has found some new hardware messages', just close the boxes when they come up, this is just the graphics card being detected.
5. Run Driver Cleaner 3, select ATI from the dropdown box and click on "Clean"
(Warning: Ensure that ATI is selected before you click clean, mainly because Driver Cleaner has the option to wipe out other system drivers if you select the wrong manufacturer from the list, and this can cause huge system instability)
6. Restart your computer once the cleaning is finished (After clicking "close" in Driver Cleaner)
7. Install the 5.5 drivers, restart the computer, play GW and hopefully your problems should be solved..
8. Enjoy GW how it should be!


Also, here's a few user suggested tips:
Suggested by Hysteria- If you have a Radeon 9600 card, ensure Fast Writes are on in the BIOS, for other cards it wouldn't cause much difference if it was off, but if you're having severe stability problems, maybe worth a try enabling it..
(Thanks for the tip Hysteria! )
Suggested by Zakarr- Use memtest (http://www.memtest86.com/) to test your computers memory for errors and problems.
(Thanks for the tip Zakarr! )
Well, this should help some of you technology newbies in playing GW if you previously had this issue, it should work, it did on my system and quite a few other systems who's owners I've suggested it to, here's my system specifications anyways:
AMD Athlon XP 2500+ Overclocked to 3200+ (2.2GHZ)
1GB PC3200 RAM
Abit NF7-SV2.0 Motherboard
Radeon 9600 Pro 128MB
Maxtor DiamondMax Plus 120GB SATA HDD
Also, stay clear of the Catalyst 5.6, 5.7 and mainly the lower than 5.5 versions for Guild Wars, these can cause other problems, and the 5.6 and 5.7 driver series caused the BSOD in my case (Plus in other systems also). From what I've found out the 5.5 drivers are really the best for GW performance and stability, and use this tutorial at your own risk, it should more than likely work, it has for myself and other users.
(P.S: I will not be held responsible for any system issues caused by this tutorial, the actions shown here should not cause any systemproblem/instability if followed correctly).
Also DC3 can be used for clearing out other uninstalled drivers, so if you've previously had any other cards installed into your machine, e.g. say an Nvidia card and have uninstalled the drivers, select Nvidia from the dropdown box and it should clean the remnants from the Nvidia drivers..
If you have any questions, then just ask me...
Stephen.
