Windows 7, No uninstall for sonar platinum, it does not show up in Control Panel, Programs. [edit] answer is below a few comments down, Reinstall the Cakewalk Command Center, "CCC", if necessary, then connect with your user name etc, then Right click on the installed program within the Cakewalk Command Center, choose uninstall.
Alas, it is not a clean uninstall, just found that it deleted some X3 VST plugins. Hells bells.