Sorry that this topic might have been visited before. I have been looking for 200 gb of used space on my harddrive and determined(by using TreeSize and other tools) that a majority of it is temporary internet files. I installed CCleaner and just checked off to remove temporary internet files. I shut everything off on my PC, like the internet and router etc. I left CCleaner to scan and knew it would take sometime. I started at 10pm and fell asleep and awoke to check on the progress at 5am. It was still scanning and I could not leave the scan going any longer. So I stopped it and discovered that 31 gb had been restored to my harddrive. Great news. But should it be taking so long? And Is it okay to stop and start a scan later? I got this PC in 2010 and never really cleaned out this junk before.
Seems to be taking unusually long, do you have secure overwrite enabled?
that is a lot of cleaning (200gb) so that might not be so unlikely, as long as you don't have wipefreespace checked off there should be no mal-effect of stopping and starting (educated guess)