2010 Custom Built PC running Windows XP Professional SP3

This is my new Windows XP Gaming PC that I got off of eBay for approximately $80 in total. I used some parts from my old computers (including the fan, and GPU). I wanted to swap the GPU with a Radeon X1300 Pro (PCI-e), but nothing wanted to show on the display, so I swapped it with a GeForce 7500 LE from an old HP Computer. PC Specs: BIOSTAR A785GE AMD Athlon II X4 640 NVidia GeForce 7500 LE 2GB RAM 120GB SSD 250GB HDD Windows XP Professional SP3