see my original posts for some background but basically after the preparing to install dialog closed that was that.
I started hunting around my machine for new files by date/time and found in C:\Documents and Settings\<myaccount>\Local Settings\Temp a folder called RarSFX0. In there were several folders, Media Jukebox, Support, and System as well as some files InstallWizard.exe License.txt and unicows.dll. Of course the folders also had files. This structure actually looks like an installation. I did not check file for file but the Media Jukebox in Temp looks very much like my C:\Program Files\Meda Center folder.
I did find this all a bit strange, the Temp folder aspect that is but it installed so I left it all at that. The version of Media Jukebox.exe in C:\Program Files\J River is the new 9.1.279.0 build.
I am wondering a bit about what is going on here. MC9.1 runs although I have yet to reboot. Think I might have myself in a bit of a 'state'?
btw.. running XP home with all the latest and greatest updates, services packs, etc. I shut down virus checker prior to the install since this can matter in some cases.