I want to upgrade my computer?

I can't help you if you don't tell me the slots available...Like PCI,PCI-E, AGP, etc. uming it's AGP(guessing from amount of ram it came with)You can only add an ATI 3870 at best. Your computer can probably only handle up to 1 or 2 GB of ram. For DVD drive, don't get your hopes up, but and IDE will probably fit it.