A few days ago I setup Windows 7, Because the problem was C drive is becoming full and after new setup still now I face this problem. I did not face this type of problem before. My C Drive space is 48 GB. and now free space is 20 GB and its decreasing... Alwasy I use CCleaner, and there are no other file/folder in C Drive without installed file. Requesting to expert, Please give me a solution for me.