All right, now I've tried the suggestions again. Eliminated all Media center stuff from the computer, including library files, & including some left-over MC11 library files, rebooted, then installed MC12 from this page's link, running as administrator.
So, I click the quick launch link, & Vista control says that "C:\Program Files\J River\Media Center 12\PackageInstaller.exe"/RegDLL C: Program Files\J River\Media CEnter 12\CDWriter.ocx," wants access to my computer, which I ok, & then I still get the same two part message, which repeats once after I get through it the first time. First, a box reading literally:
This version of Media Center must be activated by running it at least once with Power User privileges.
After this activation, Media Center can be run with only guest privileges
(Unactivated Component: C:\\Program Files\J River\Media Center 12\CDWriter.ocx)
Once I click on this one, I get the following error box:
Failed to create CD writer control (CDWriter.ocx)
Click the OK on this one, & the whole thing repeats once more from the account control request.
Any more ideas?
Thanks.