1997 Chevy Cavalier Possible Compressor problem. Again

Air Conditioning problem
1997 Chevy Cavalier 4 cyl Front Wheel Drive Automatic 101K miles

I had my compressor (along with other required components) replaced last October. It has worked great until about a week ago. It's doing the same exact thing as before. I believe the compressor has locked up. I go to turn my car on (ac off) and it makes this terrible screeching noise. If I try to turn the a/c on, it shuts my car off completely.
My compressor and clutch is still under warranty so I can swap my old one out for a new one free of charge. My question is: Can I get my bad compressor taken out and then take it up to the shop to swap it out without harming my car (can I drive it without a compressor)? Last time I had to switch it out, I bought all the parts necessary first and afterwards, took the old parts back to get the money back. In this case, I don't have the money to buy the new compressor.
ALSO, if you don't think its the compressor, what else could it possibly be?

Any info/help would be GREATLY appreciated. My windows don't roll down either and I live in South TX so I am absolutely miserable.
I'm not sure if any other info is needed but here may be some stuff:
The compressor was bough tin October 2007. It Is a NEW (not Re-man) Delphi compressor w/clutch
The engine is a 2.4L
I had the orifice and accumulator replaced and the system was flushed. I may have had the condenser and other parts replaced as well but am not positive.


THANKS
Kristi