Video in on RADEON 64



I can't get the V In to work on my RADEON 64
when i start it up i get an error to check if another app is running like a dvd player or web tv i didn't have this problem on win98
but I think it may be the new WINME movie maker as it seems to work fine in that.
I don't have webtv installed and didnt have it installed on WIN98 and i was able to watch tv through a VCR but when i tried to have a football game playing on the ATI video in and play Halflife at the same time it kept crashing. was that too much for the card to handle? i have a p3 800 with 256 pc133 ram so it cant be system.
Any help ??????