first of all using codec packs with Windows 7 is a very bad idea. Codecs packs are almost never designed to work seamlessly with windows and end up messing thing (feel free to browse the forum and see comments from other users - as recent as
2 days ago).
1. I would suggest start wtih a clean install of Windows (no you can't uninstall codecs packs they permanently damage the registry and setup).
2. Update to 2.3.14, there are many fixes to stuttering audio and video with newer version of the encoder
3. Then if you're still facing a problem upload a copy of the original wtv/dvrms video to dropbox and post the link here.