Thanks for your reply.
When canceling, I do get a message telling me files to be erased. As I wrote, this was 4000 files and over 1 GB of disk space when I cancelled after 50 minutes of scanning (the longer the scan runs, the bigger the numbers).
It sounds like what you are saying is I am accumulating a very large number of files in this hidden folder, even though I clear my Internet cache every time I leave IE?
Frankly, the fact that it is such a large number of files and takes up so much space makes me skeptical, but I suppose it could be true. Before I let CCleaner erase them, I wanted some feedback to make sure I would not be erasing important files.
Is there a setting I can modify so these files do not accumulate like this in the future?