Source Recorder audio sync

I have this problem:
I record a movie with source recorder the i convert it with virtual dub i see the audio is recorded at super speed and doesn’t sync with the video. I already tried the option “Change so audio and video durations match” and my video is as fast as the audio is and i don’t want that. At the beginning it recorded well with normal speed for both, but at some point it got bugged (i think that’s the word). Please help me. What can I do ?

Here a sample with what happens http://hotfile.com/dl/26523201/458c64a/tankattack00001.avi.html

Any1 ?

use wave pad to slow it down?