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#21
Well let us not forget that CCleaner even has a tool for removing particular restore points so you might as well remove restore points created on occasions with less system priorities such as antivirus updates.
Right click Computer on Desktop then Properties>>>System Protection>>>choose your drive>>>Configure and from there you can allocate how much disk space you will allow Windows to use for restore points so I think you can just set it to 5-10%.
Windows 7's own defragging module is rather slow and like what was stated on one of the previous posts, you should do defragging AFTER you've done disk cleanup or have removed the junk files because after the junk is eliminated, there would be less files to defrag and the defragging operation will be slightly faster.
CCleaner is a great tool, I have a mate who uses computers on shops outside and CCleaner was able to remove like 2GBs junk files in some of those computers.