Dear Purrball - THANK YOU VERY MUCH. Your registry fix was the "Cat's Meow" (sorry 'bout that

)
I struggled for several weeks now trying to get WB 5.51 installed successfuly. The WB 5.51 installation went through the motions, but after a re-boot Windowblinds wouldn't start automatically. I had to start it manually and set my skin each time.
The fix for those having similar problems is to run the registry fix above, exactly as Purrball describes, reboot to start the service, check your service list to be sure the Stardock Windowblinds service started, then re-install 5.51. That worked perfectly for me. You know 5.51 is installed properly if:
1. Windowblinds starts automatically on a re-boot and your chosen skin is applied
2. You go to Display Properties, click the Appearance tab and your chosen skin shows in the "Windows and Buttons" box (XP system, Vista may be different).
If the display properties show Windows classic style in the "Windows and Buttons" box, try running the registry fix again and re-boot to see if the service starts. The key to completing the installation is to make sure this service starts on boot-up.
If you follow this process, there is no need to uninstall any security software. My suspicion is this problem is related to a conflict with the Bitdefender security suite, but I'm not 100% certain. This fix worked without disabling Bitdefender or removing anyother software.
Thanks again Purrball. Now if only I can convince you to make those Noix taskbar buttons a bit brighter and bigger for old eyes like mine
My best,
Sleep