i'll get a 5670 after a month. But i want to play those games on this pc which am going to get within a week.
The graphics card makes me think this is a laptop.
If so, you're stuck with the graphics card that you have.
GTA4 will be extremely poor, possibly playable at 800x600. Crysis, same thing. For black ops, you're going to have to make sure that the game knows that you have a dual core, and that you aren't running an SLI configuration. I would also be extremely worried about overheating issues.
There's a chance, but I wouldn't keep my hopes up.