You might try PCWizard, available here: PC Wizard 2006. It's self-explanatory to use and might be able to identify the hardware, though since it's not installed in XP I don't know if it can.

(If you still have the old 98SE on the old disc you could look though the drivers there to see if you can identify the one for the TV and then try and locate the model from that - look for drivers directories under the old Windows directory, then try to find XP drivers for it).

You might also try and get the chip identification from processor chip on the card and see if you can use that to locate a driver.

Mick