Walsh_grat :
i think the power input is 250 watt. is there any way to increase the power supply and the pci version is 1.1 and it support upto 2.1 pci-e graphic cards but the card suggested by you is 3.0 pci-e
Only by replacing the entire power supply. This system is nearly obsolete my friend. I really would recommend holding on a little longer and saving some cash for a new system - possibly building your own (it's actually pretty easy, always cheaper, and you'll find free help here.)
What are you using the computer for? Why the desire for a graphics card?