Harddisk space decreasing on Windows 7

[Newbiekid]

Hi, I am wondering why my Harddisk space on windows 7 keeps decreasing. From 30 Gb of free space to 13Gb. As i had 2 partition. All my downloads are in my second partition while i only store applications like games in the first. However i did not download anything but my free space in the first partition kept decreasing. I tried turning off system restore but only about 1Gb was restored. Is this some system settings with windows 7?

Thank You.

 

[jbakerlent]

It wouldn't account for ~15GB, but try downloading and running CCleaner.

 

[Newbiekid]

Best answer selected by newbiekid.