CCleaner free v 4.16.4763. Windows 7 Enterprice 64 bit, HP COmpac 6200 Pro MT
I installed and ran the program.
I set it to save the settings and run when the PC starts.
I ran Cleaner (once) and Registry (twice).
Then I rebooted the PC.
When The system was in desktop there appeared a talk bubble down right in the tool bar telling that the system was installing a driver.
Then it told that installing "PCI Simple communications controller" failed.
This same message appeared in all the computers, which were tested.
Computers wer of the same make and model.