"Driver" is a special program which allows your operating system communicate with hardware - keyboard, mouse, printer, graphics and sound cards, etc. Usually those for graphics card need to be updated regulary (if you care ofcourse) since their manufacturers fix bugs and enhance its work.
Hmm, yet somehow while nVidia at 64 megs has never failed me for 5 years, ATI Catalyst caused a huge fiasco on my new (no older than 3 months) Alienware with 256 mb... hell to ATI, stick with nVidia.
Also, 56 ram? Isn't that low?
Maybe it would be better to invest in one of those 300$ dells that could run games from 3 to 4 years ago... or maybe it is the drivers... again, i don't know for sure, technology and I are like school and summer vacation... damn, summer is over soon...