Call of Duty: Black Ops Problem?

I've had this game since a long time, but last time I installed it, I couldn't play it. It lagged too much. Now I installed it again and put all the settings at minimum level, and it plays normal, even though my system hardware is a little lower than the requirements.

So, I watched the intro, and right after the line in which they went to kill someone after the interrogator says "Do you remember Dragovich"?, the screen goes black and I get a mouse pointer. This also happened the last time I installed it. I can move the mouse pointer, but the game itself doesn't work - the screen remains black with the mouse pointer. I've tried reinstalling it, but it doesn't work.

So, I wanted to ask if there is any patch out there to make it work or some kind of hardware requirement lack.

To be clear, my system specifications:

RAM: 1.75 GB

OS: Microsoft XP, SP2

Graphics: nVCIDIA GeForce 8300

Processor:

AMD Athlon 7750 2.7 GHz

I know my hardware is lacking, but it still plays like normal after I set the graphic settings to low levels.

Any solution?