You probably have 2 completely different pc's ...his being older. If your pc is fairly new you probably need the newer DDR2 ram. Your Pa's ram is likely ddr400 186 pin or something if its AMD i'd know a little more about it. But yeah... that sucks.
Suggestion:
EBAY! you may get enough money for that old ram and card to help purchase a new video card. You can pick up a decent PCI express gpu for around 150 bucks these days. I use 2 geforce 7600 gt's and they are great!
I Ebay off old parts all the time and use the money to purchase new parts. Its also a good way for the wife not to get involved...tee hee....
So maybe this is still a good thing.