I've just installed the latest version of ccleaner on Windows 10 Fall Edition.
I've started ccleaner and it seems to be running, I can see it in the Task Manager, but there is no ccleaner window displayed, so I can't actually use the program.
and if that doesn't work, obviously try a reboot first, and if still no luck try this;
uninstall your current version first.
then go into the Program Files folder for CC and delete its contents (keep the .ini file if you have customised settings).
download the latest build from here; <a href="https://www.piriform.com/ccleaner/builds" rel="external nofollow">https://www.piriform.com/ccleaner/builds</a>
reboot the PC
install CC from your downloaded file.
None of that worked, I don't get to see any window to use the actual program in, so I'm a bit snookered here. Certainly running though as I can see it in task manager.