I thought to improve pc hardware settings to play some good games.
Pc specification now :
Ram = 2gb DDR2
HDD - 320 gb sata
processor - 2.40ghz intel dual cpu
os- windows 7 32bit
Trash your PC rather then upgrading it. My golden advice. Get Ivy Bridge based good CPU, RAM, GPU and Mobo to play BF3 and new games.