Hi,
I have a two suggestions, first off limewire:
Standart LimeWire makes a Directory in the my Documents that is named 'Incomplete'. You'd be supprised, my friend had FOUR GIGABYTE of unfinished downloads there...
Secondly:
I notice that windows contains alot of *.HLP files... I'v personally never used them and mannualy deleted them. Im not sure if its oke to put it into CCleaner but its just an suggestion