Here's the most current situation ...
Was running WB6 on Vista. Installed WBA files to separate partition. Did that because I was doing weekly partition backups and didn't want to backup the skins every single time. At that time, there was only one OS on this box - Vista. That partition can be read by any OS on the box now -- Seven or Vista.
Downloaded & installed Impulse. Opened Impulse, selected WB 7 & installed it. Appeared to go OK. Rebooted.
Started WB 7. Noticed that only three skins displayed properly in the panel (Classic, Aero, Random). Other skins showed as "unknown" and did not display a rendering in the config panel. When I clicked on the "unknown"s, got the names of the WB6 skins. Selecting a skin and applying it forced me into Windows Classic mode with no visual effects.
Posted to this forum. Got links to 4 WB 7 skins. Downloaded & installed them. Rebooted.
Same symptoms with the new WB 7 skins. Selecting any WB 7 skin forced me into Windows Classic again.
Opened Impuse, uninstalled WB 7. When done, Seven Basic desktop returned ( video chip doesn't support Aero). Opened Impuse, noticed that WB 6 was uninstalled as well, even though I didn't request that.
Copied all the WB 6 skins from the shared partition to an external drive. Removed them from the internal drive. Uninstalled WB 7 -- which uninstalled WB 6 as well. Went into C: drive, removed all the WB skins and directories. Didn't touch the registry, though. Rebooted.
Latest (yesterday):Made sure that there were NO WB skins on the internal drives anymore. Reinstalled WB 7 using Impulse. Rebooted. Noticed that (1) WB 6 got installed as well, (2) WB directory has folders for ALL the previous WB 6 skins as well as the four WB 7 skins. Looks like it's squirreling them away SOMEWHERE so that it's reloading them after a reinstall.
So basically, I'm back to square 1. Don't appear to be able to install only WB 7, and I'm guessing that the co-install of WB 6 (which I believe does NOT work with Windows Seven) is at the heart of the problems.