If you haven't already trashed the card, the following may possibly help.
Loading the sound drivers after the MMC drivers leads to random freezes in the MMC. You need to de-install, then re-install the MMC. Don't keep any old settings when offered. If you have DX8 installed don't use the install option on the main menu of the ATI disk. This will overwrite DX8 with DX7 and trash Windows. There is a setup file buried in (i think) a mmcdvd subdirectory buried several layers deep. This only loads the mmc.
I am not aware of anyone using an AIW on a AMD/VIA system who is successful with the 7072 drivers. I have come across a lot who are not. Problems happen in record mode, probably other mmc functions. TV looks great. The 3063 drivers are the latest set I have made work. These, so far, work flawlessly.
SYSTEM
Win 98 SE
Tbird 900
Abit KT7 Raid
2 X 128K Crucial PC133 CAS2 memory
AIW Radeon
Aureal SQ2500 Sound
2X WD 45 gig 5400 rpm in RAID 0
Creative Encore DVD
S&F Speedwriter R/W
+ some other junk, no network.