Sorry for posting above since my issue is not the same as the OP. I thought it might be related. Anyway, I deleted my cache using firefox tools and then ran ccleaner with no problem.
When I ran ccleaner it sped along until it hit firefox/profiles at about (42%) and then it crawled viewing each file for about 5 seconds. I let it run for an hour and it remained at 42%, so I cancelled. What is going on?