i have a hp dc 5850 small form factor and i am running windows 7... i would like to upgrade my computer to play games..... i play far cry 2 with no problem .... i bought gta iv and it is almost playable but is slow and the graphics settings are as low as they go.......i would appreciate any info about this issue.... my computer specs ..... amd sempron(tm) Processor LE-1250 2.20 GHz, 1g RAM (i think its capable of 4g not sure ), 32 bit, my video card is ATI RADEON 3100 if you need any more info let me know thank you