If you can’t see it there then try the control panel (open the start menu and type in: control) and go to Programs>Uninstall a program.
Right-click on CCleaner 7 and select Uninstall:
If all else fails you could reinstall 6.39 from here
which should put the uninstall option back for you. Download it to your machine, install it and then look in Windows uninstall list to see if it is there.
Are you trying to uninstall CCleaner from within CCleaner program ? (the uninstall list)
Just checking you don’t have the portable version do you ?