First, let me say how new I am and excited to be playing Guild Wars, and I come to you with a fix to a common problem
I'm sure all you prospective buyers (who, like me, have Dell Dimension 2400's [there are a LOT of us]) are wondering whether your system can handle Guild Wars, and hearing the nightmarish bug stories has made you kinda scared to buy this game. Well, I am here to put your fears to rest
My computer (after an upgrade) has 768 MB of DDR RAM and Intel Extreme Integrated Graphics 2, an unworthy substitute for a nicer video card. I wasn't keen to chunk out 130$ for a new card, though, so I gave the game a shot
IT RUNS FINE WITH INTEL EXTREME GRAPHICS CHIPSETS, but only as long as you have enough RAM for your system (I'd spend the money if you don't have a good bit of RAM like I did before my upgrade). One of the first problems I ran in to while playing, however, was dealing with some ialmnrt5, and I feared I would have to buy a new video card after all.
I tried upgrading my drivers, but that only eased the problem a little. The game would still mess up almost everytime I tried to slide items around my inventory.
Then I read a suggestion to download an older version of the drivers for the chipset, and I did. I haven't had any trouble since!
Of course, this is all at the lowest setting, and the game runs (and looks, in my eyes) perfectly fine.
Intel® 82845G Graphics Controller
This is the driver version I upgraded to in attempt to fix that didn't help very much
14.10.0.4020
So I rolled back the driver version to this one (running a search for intel extreme 6.14.10.3889)
6.14.10.3889
I haven't had much trouble since, save for a little lag in very detailed areas.
I hope I helped ease your mind, my fellow lowend system users!
D

Go to Newegg and start shopping. While you're at it pick up a low-end $60 video card that will obliterate your Intel Unextreme Graphics with Unextreme Intel Drivers (yes, it's true).