Or if you want to keep your old video card then you can get the ATI TV Wonder. I'm using it in Windows 98SE and have had no problems(I've heard the cards Win2K Drivers are suspect though)
The only real problem is that if you want to get the best picture quality you have to go with the AVI format and those files are just huge(Gig a minute) or you can take a slight performance hit and go with the MPEG-1 encoding.
I don't really record from TV much but if thats what you want the card for my suggestion would be to record in a high level mpeg and maybe convert it into a managable size with some other program.
I here the AIW has better capture formats but you'd be buying a whole new vid card.