I used my wife's PC (Windows 7 ) to download & install Command Center. It failed to install.  Had to used Task Manager to stop the 4 instances of Command Center that were running.  Logged off & then logged on as administrator and was able to complete the install.
 
RANT ON:  This Command Center software is terrible!  When I ran it under my wife's ID, Windows asked me for the Admin password which I gave it.  Still the install failed to complete.  Clearly there is an issue with user rights.  Once I logged in as the administrator the install went OK.   Why wasn't there a notice that you need to be logged in as an administrator to install Command Center?  Nothing on this page:
 
http://www.cakewalk.com/Products/SONAR/Try-SONAR#start
 
I am not impressed with the development team.  RANT OFF.
 
 
I downloaded Sonar Artist Demo.
 
Once Sonar Artist demo was installed & running I uninstalled Command Center.
 
After looking at Sonar Artist I decided to uninstall it.  I can't find a way to uninstall Sonar Artist.  Why isn't Sonar Artist demo listed when you use the Control Panel Add & Remove Programs?  Or at least a Cakewalk uninstall program?
 
How do I get Sonar Artist off my wife's computer?  This is so 1998.

In Command Center, click on "Uninstall" in the context menu for the product.
 
If you already uninstalled Command Center, look into the folder, where CCC was installed (C:\ProgramData\Cakewalk\Command Center), there should be a folder Cache/Uninstallers that contains the uninstallers.

Hi. You should be able to uninstall via both CCC (Cakewalk Command Center) and Control Panel / remove programs. Are you logged in with the same credentials as when you installed? Which version of CCC do you have?
I have not had any issues with CCC regarding installs, rollbacks or uninstalls. 
All the best.

I wasn't a big fan of CCC myself when it was released but I have had nothing but great experiences since I've been using it. it makes it so easy to update to new products as you don't have to go looking for them, they are all in one place. Sorry for your problems man. better luck on finding new solutions.