I don't know what to do

P4 3.06GHz

1.5GB DDR RAM

7600 GS

160GB PATA HD

Intel D101GGC motherboard

Vista Home Premium

19"W Acer LCD 1440x900

I really want a new processor but i would basically have to replace a lot of things, but i can't afford to do that

Processor is fine for now. You might want to look into getting something like an X1900Pro or X1950XT. Better yet, if your power supply can handle it, and you have the money, go an 8800GT. another 512MB stick, or even a 1GB stick of RAM would be great as well. Go for the card first though. Hard drive is kind of small, so an investment in another one or an external hard drive would be good as well.

I'd take a close look at how your ram is setup. You might be gimping your system by running ram in single channel mode. If you have two matching sticks of 512, it may actually run faster if you pull out half a gig and run the remaining in dual channel mode. Double the memory bandwidth is very helpful. That you can do for free too.

If you upgrade the video card now, you can always upgrade your Mobo/CPU/Ram later on and use the same vid card in a new build since it would be PCIe.

well my main goal is to be able to play games at native res with high-max settings.

and i bought the card nov 06, so i guess i could upgrade to an 8800GT

WEI has my memory and processor at 4.2