I have the same problem. Other help sites have talked about removing the .1 on the end of files msdv.inf and msdv.pnf but for me the files did NOT have the .1 on the end of the files. So, there was nothing to remove from the files names. This is a new dell computer with factory install of XP. Don't know what to do next, can't find a solution for the "AV/C subunit" hardware not be recognized.(posted 7524 days ago)