No. Read the first post again to see exactly what happens.
I think you are taking my figures a bit too literally. I have no idea how many times I have executed CCleaner over the years but I know that on 3 or 4 occasions in recent months the program has launched before the UAC prompt appears (you can see it happen before you select yes or no) and selecting NO still allows you to run the program. So 99% is just an rough approximation and not an exact figure.
No need to take the piss.
All that happened was a few months ago I ran the program and instead of the UAC prompt appearing first CCleaner appeared first THEN the UAC prompt appeared which blocked access to the program until you choose Yes or No. I noticed this because normally programs don't appear until after you say Yes to the UAC prompt and wondered if CCleaner would close if I selected NO. I clicked NO and CCleaner was still running and fully functional. The majority of the time the UAC appears first and you have to select Yes to get CCleaner to run but on 3-4 occasions CCleaner has run before the UAC prompt and on each occasion I have spotted it I have selected NO and still been able to use the program.
Yes it's probably a fault in my hardware or Windows. I'm not blaming CCleaner - I only asked if anyone else had seen this. Don't worry. I'm not.