Supposedly my AR41M have the same M115S tv avermedia hybrid card as the AR21M have. So if I try the driver from the AR2_Drivers.zip package, which is version 3.3.23.73 and WHQL certified, dvb-t should work on my AR41M under xp media center.
After trying that, I must say DVB-T channels don't work.
How that is possible, if the tv card is the same? (unless AR21M already had that problem, which i don't think)