c derive automatically fill up

Hey there shadath. What OS are you using? Have you checked the Downloads folder for older downloads? This is the default path for download, it is located on you C: drive in your User Folder? You could also try cleaning up your temporary files as well. Take a look at this article here: http://www.howtogeek.com/125923/7-ways-to-free-up-hard-disk-space-on-windows/ it has tips on how to do the things I've mentioned and a few other ways to free up space on you C: drive.

Hope that helps.
Boogieman_WD