Yesterday I forgot to test it but today - no more hiccup!

Congratulations. Well done!

YES! Whew, glad this got figured out for you! Took all of us, I think!

Update: the issue seems to be solved but I tried to replicate the glitch. I spawned a Virtual Machine ( Win 10 ) and installed the free CCleaner and began re-playing some Starcraft 1. ( gaming on Virtual Machines is generally horrible but Starcraft 1 is not very demanding so no problem there ).

Anyway there was no 5:30 hickup but at 5:25 PM local time the game totally froze. Had to restart the VM. Might have been a coincidence. The rest of the time the game plays just fine. I'll make an other attempt some other day.

Why do you want to replicate it?

Fogfighter, I thought about doing that too! Interesting coincidence!

Just curiosity. Interesting to see if a virtual machine with the CCleaner behaves similar.
I have also never tried the CCleaner before.

Please let us know if you make the test.

I'm probably not going to have time, Fogfighter! I'm buried in tomatoes right now!

The CCleaner had been on my system for some time but the hiccuping was more recent so it must have been triggered for some reason, not just that it was installed on my system - and not that easily replicated then.