Well I don’t know if this helps you at all, but my friend just upgraded his old gateway:
p4 2.8, 1gb ddr, x800xl agp, 120gb ide hdd
to
athlon x2 4400+, foxconn am2 motherboard, 2gb ddr2, 8600gts pci-e, and 320gb sata hdd for ~$400 altogether.
Might be somethng you want to consider to bring your computer into the 21st century 😀