I am a contributor to Defraggler and Ccleaner so these comments are intended to be constructive. Running Windows 8 upgrade on a HP Pavilion 64-bit. I do regular maintenance and have no viruses. Defraggler is running very slow. When the defragmented files reach zero and the percent is, lets say 60%, it continues to run until 100%. Why?? The time remaining might as well not be there as it's so inaccurate.