Why won't 18 Wheels of Steel Haulin' run on my computer?

we can not help unless you give us your system configuration. (hardware, OS, driver versions)

@ragingloli – yup.

@mathwhiz1 – sounds like your new computer is using onboard graphics, but you’d need to tell us what computer/its specs before we could advise you at all.

i have a pc. my operating system is windows xp. here are the stats on my computer:

AMD Athlon 64 X2 Dual
Core Processor 3800+
2 GHz, 896 MB of RAM

let me know if i need to provide more details. thanks!

we need to know what graphic card you have.
(but from the other specs, I don’t expect a lot.)

i have an ATI Radeon Xpress 1250

Well there’s your problem. A shared memory integrated Graphic chip. (which apparently eats 128 mbyte of your RAM.)
Long story short, you probably will need to buy a new graphic card. (the current one uses your main memory as graphic memory, which makes it slow, and it makes that part of your RAM unavailable for other tasks).
Make sure that the one you buy matches the graphic slot on your motherboard (either agp or pci express, refer to your manual).
or better, tell us what model your motherboard is, so we can give you some suggestion as to what card to buy.