The method silver uses may not work for everyone (it didn't for me)

No offense to silver, it should work for most of you and it's the least invasive to your system.
Anyway, if that method doesn't work you can download and install "Sandra Lite 2007" by sisoftware. Talk to your dad about it first. You don't want to get him mad and not buy you a new card. Tell him *why* also. He may know what type of slot you have already.
http://www.sisoftware.net/index.html?di … =en&a=You can do all sorts of system diagnostics with it. It should also tell you what type of videocard you have (AGP or PCI).
To buy the video card I recommend at least an Nvidia 6800 with at least 256 MB of ram (I'm a fan of Nvidia, but ATI cards are also good). A 7900 would be nice but it's expensive. Once you find out what type of slot you have I'd recommend reposting that and mentioning what your budget is. Once we have that info I think we can give you some good feedback.
Lastly, when you do order just use Newegg. The same stuff can often be found at a "killer deal" on some other website. However you only have to get burned once on one of those and you'll have lost any savings (I've seen it happen time and time again).
P.S. Do you happen to own a generic Dell? If you do post your "Service Tag" and we can find out the info about your system. The service tag sticker should be located somewhere on the exterior of your case (only if it's a dell).