Many thanks to you hazelnut. Setting it on the English language did the trick ! Case closed... until there is a fix on the other languages versions.
Mulaw
I will look into the settings and applications. I'll be back on this. You say that you have no problems with CCleaner v.5 on your Windows 8.1 systems(*). Do you also have KB3000850 installed as I do ? (*) Win. 10 is a different matter...
siliconman01, Thank you for responding. I just ran Disk Cleanup to erase the system files (± 400MB). Unfortunetly, no improvements : After a new install, CCleaner v.5 froze again. But CCleaner v.4.19.4867 (64 bit) works flawlessly on my computer, along with everything else...
I am on Windows 8.1 64 bits. I downloaded and installed the latest CCleaner v.5 (64 bits) yesterday (2014-11-25). The cleaning mode took an unusually long time to scan. When the analyse results were finally displayed, the program itself stopped responding. Had to kill the program with Task Monitor. I tried again a few times to no avail. Had to uninstall CCleaner v.5. I have been using CCleaner for a very long time. This is a first !!