help me.....mpeg3 problem with virtual dub

[dmerola]

I have a bad problem. When I try to have mpeg3 audio from pcm with Virtual Dub, it give a protection error and stop the conversion. The first days I installed Virtual Dub the conversion from pcm audio to mpeg3 was ok but now no!!! Can it be a problem of some driver or program I installed in this days ( Lava for SBLive! or scanner drivers )....I hope in you help.
Bye
Daniele