It should work no problem. What kind of motherboard do you have anyways?
If your motherboard is too old, it may not work. Also, be sure that there are no capacitors or anything that would block the edge of the AGP slot...the geforce 4 cards are VERY long.
Yeah if its an old AGP 2x mobo, your processor more than likely will not be able to keep up with the GF4...so you won't get the full performance out of the card.
Now another thing is some AGP slots might not provide the proper 1.5v that the card requires, several old AGP slots only ran at 2.2v (i hope i have that right).
I had a 440BX board and a GF2 won't work....something to do with higher voltage requirement on the newer cards...like Kelly says. But the only way to actually find out is to try....that is if u can still return the card if it doesn't.