Video Recording - high speed

I am not sure I am posting this in the right place, but hope someone here can help. I subscribe to a satellite service and have many, many hours of recorded programs on their DVR that I want to move onto DVD. Their DVR is encrypted. Only way to do it is to play the recording, and using the analog output of the DVR, record it on a standalone DVD recorder or on a computer with appropriate software. I have tried this with Windows Media Center, but find no way to convert the WTV files to normal DVD formatting so they can play back in regular DVD player, unless I want to pay $100 for software. The worst part is that it records in real time. I have to play a 3 hour recording for 3 hours to record it.
I am wondering what would happen if I played back the recording at high speed (DVR allows up to 300x for fast forwarding), recording at high quality, and then tried to play it back in slow motion so that the playback is actually in real time. Even better would be to capture it on the computer, then take the AVI or other computer generated file, slow it down, and convert it into normal DVD format running at normal speed.
Anybody ever tried or done this?