Can i upgrade the graphic card on my pc?

Solution
That card will work perfectly fine in you computer and it will work with your 250w power supply. A GT210 uses a very low amount of power.

firo40

Splendid
Nothing ATM you will need to buy a new power supply as well 250w is way to look look for something 450w and made by xfx seasonic corsair or antec then the best I'd use with your system would be a gtx 750 to or a r9 270x anything higher will be bottlenecked by you CPU pretty bad