do you know how much free space there is left on your hard drive something is really wrong with what you are saying:-
System Mechanic Professional 7. Local disc(C) properties are:- Used 18.6GB and Free 18.5GB.
drive C is normally the main system drive where the operating system is stored, WINDOWS XP can be 3GB and more (Windows folder size on my own computer is 3.5GB), almost everything is stored on C Drive, unless you personally save files on another drive. how many drives are there in your computer ? what is the operating system ? what is the specification, manufacturer,ram quantity, CPU ,