1. CAMTASIA 2.0 (find with google)
2. AUDACITY (find with google)
3. Turn down video acceleration as noted at http://www.zachd.com/pss/pss.html#screencap

Capture both video and audio with the above free tools, then use VIRTUAL DUB (another freebie you find with google.com) to rejoin the video and audio.

Bob