before i rang cclearner i had over 80gbs free space, which then when to 800mb than i transfer some files about 20gb worth and then ran ccleaner gaong i now i only have 748mb left on c drive, i thought cclenaer meant to cleam not complettly fill mu hard drive, which it like that the system restore beeing turned of and the computer is now whay to slow
you had wipe free space checked and it didn't finish.
you can either run the WFS again and it'll cleanup after it self or open the C:\ drive and find the giant file (it'll be a file with a string of alphanumeric (i.e. kjlasdsjaskjajh3883nd) and shift delete it)
after doing this uncheck Wipe Free Space, it is the consensus here that it should only be checked off if you are selling the drive (search Wipe Free Space for more information on this opinion)