tyleriswondering

ok my nephew just recently came to me with this old comp. that his frind gave to him so i put a gig of ram in it and installed a network card now i wanna put a graphics card in i no i cant use a pci express one just pci so would this graphics card work-BFG - NVIDIA GeForce 8400 GS 512MB DDR2 PCI Graphics Card??? and he wants to play this game counter strike si this enoguht to play it or any more upgrades please let me know thanks