I just purchased a Sony VAIO desktop with all sorts of
input jacks; RCA plugs, firewire, coax, S-video. I
connect my VCR's analog outputs to the RCA jacks in either
the front panel or the rear. When I try to "Capture Video"
via the pre-installed MovieMaker v5.1, I get an error "A
video source was not detected. Verify that a device is
turned on and connected properly, and then try again." I
think I've got the VCR connected correctly. Anyone got
any insight into what might be wrong? Thank you.

- Gary

Same happens to me. Seems like MM works only via IEEE1394 connection. If you have an NTSC tape and, I hope, you got GigaPocket with your Sony, you can use GigaPocket to capture analog signal and then import it into MM.
But I had to reconvert .MPG GigaPocket video capsule into .AVI first using DVgate Plus, because my MM doesn't understand .MPG GigaPocket video capsule (sound, but no video).
I would like very much to resolve analog video capture with MM, because it suppose to understand PAL signal as well and that's why I need it. GigaPocket shows PAL signal as B&W and with very poor quality.