This does not sound like a Windows Vista issue. And brings to mind about 20 jokes about VCR programming.
What happens when you try to do this? How is the VCR hooked up to the system? Are you trying to make it change the channel, turn on the cable box, etc... or just start recording.
1.The wall cable goes to the Comcast converter.
2. using the abc cables from the Digital converter to DVD/VCR unit's record IN matching the color coded plugs to the jacks.
3. Hooked up a second ABC cable from the DVD/VCR unit's AV OUT to the TV's input jacks on the back of the TV set.
I have a Magnavox DVD/VCR combo recorder W/ tuner
I want to record future programs with the converter. I can playback Tapes and discs but I cannot record anything.