It's interesting that CCleaner solved this problem for nothing. The use of such utilities on the forum has been heavily discouraged. Recently, I battled to update Internet Explorer from version 9 and it just seemed impossible. In desperation I threw in CCleaner, Glarysoft Utilities and just about anything else I could find. They made no difference whatsoever to the problem with ie9 but the one thing that became very evident was how much faster the boot up and overall performance of the computer running Windows 7 was.