I have had the same exasperating problem.
When I install WB5, I get the usual pop-up asking me to reboot my system, but when I reboot, I get the same pop-up asking me to reboot my system again. If I launch through StarDock central, the same happens again.
The exact wording is this:
This machine MUST be rebooted after installing this version of WB5. Please select one of the buttons below.
Reboot Now
I'll reboot later.
I have paid for this program and have it on the CD I paid to have sent through snail mail to me. This is NOT a hacked copy. This is the real mccoy.
Also, several things I noticed that seem to be in common:
I also have Ghost Surf 2005 Platinum installed as well as AVG 7 Pro. However, I made sure both were completely unloaded from the systray before installing Stardock's Object Desktop which includes WB5. However, I did NOT unload the extra pieces of AVG that remain in the task manager after unloading it from the systray.
To quote Mike:
"I was *just* about to format my harddrive and try again when I had a change of heart (couldn't face reinstalling everything) and went looking for *anything* that might be causing this. Well, I found it: Tenebril's SpyCatcher installs a service called Tenebril Antispyware Satellite which its uninstaller apparenty does not remove. I had to go into my registry and cut it out manually. I had installed this as part of the GhostSurf Platinum 2005 suite. Thus, when I uninstalled the suite yesterday and tried to reinstall WB5 this service was still running and blocking some key writes to the registry. I've just confirmed that the WBSrv key is still there (again, after three reboots)."
I do not know how to go into my registry and cut it out manually. I need that information, please. (Hoping Mike will impart his wisdom!)

I'd like to know how I can "go back" to WB 4.6 when I never had that before?
Thanks for all your help.
-nobodyzsukey