You're welcome.

Yes, you should disconnect anything connected to your USB ports when capturing the movie via USB. If you upgrade to firewire you'll be able to download a format suitable for burning on DVD.

Also be advised, the raw format of the captured movie via firewire could take up to 20GB per hour at its best quality, so consider using a balk space in your hard drive. Then you can convert the formats to a lower capacity file. You'll get the best results if you reduce the resolution when converting the formats rather than the time of capturing the movie.