I had to stop the disc cleaner from working. It would come on every time the computer was started. It would run to around 23% and then looked like it was just setting there. I am not sure what you are talking about when you say "internet explorer built-in delete function". If you Cancel the Analysis on CCleaner, it will bring up the amount of files it has found so far and says it can delete them. It says "Analysis Canceled (5583,561 secs) This Analysis is incomplete - 14,830 MB to be removed - Internet Explorer Temp Files.- 15,185,833KB and 586,695 files." I have put it on Run Cleaner and will let it run until it stops. It will take a long time. I just thought maybe something was wrong with the program but I guess it is working right. If I thought it would not hurt anything, I would go into the Data app/Local and remove most of what is in there. Some people on the Internet say it won't hurt and other people say to leave it alone. This is a very slow running computer. It only has 1 GB harddrive which is probably its biggest problem.