I have just upgraded my system and am now having trohuble with capturing in both win98 and xp

I can capture OK in Win98, but as I am capturing to convert to DVD, I need 48000khz audio. When I select audio compression, it only goes up to 44100khz. Now my soundcard supports thsi, as I've had it working before (Soundblaster 128 PCI), but whatever I do (installing the drivers, disabling stuff), I still can't get the option to choose 48000.

Anyway, in Windows XP.....
I have been using this for ages to capture, using a patch files in the Matrox folder, but now I've got a new system and I've reformatted I can't get it to work properly. I CAN selct audio 48000, but sometimes it captures fine, the capture again and NO FRAMES are captured. This happens with AVI-IO.
I know this should work, as I used it with my old system for months. Could it be my new board and chip?
Anyone else got these problem