My computer is terribly low on C:drive space?

Reinstalling operating system is the first choice,then using a registry cleaner is necessary,which can optimize your PC performance in order to free up space in C:drive.l recommend this one for you,Fastwindowstweaker:a href="http://www.fastwindowstweaker.com" rel="nofollow"http://www.fastwindowstweaker.com/a