I ran windows 2000 awhile ago and got no support for my tv wonder... ATI did release new drivers for this card, version 2.00, however i believe that was just to correct the overlay problem with some video cards (voodoo, tnt) Best I know,ATI is still snail mailing those drivers, they wouldn't post em on their page for "legal" reasons. If you're using a TV Wonder VE, it uses different drivers and if the retail drivers didn't work, i don't believe they have updates yet.
Just did a search of ATI's page and found that they plan to relase the beta 2000 drivers for all TV wonder products in september (yeah right) i suggest checking back in september.