|If it seems to be filling up that fast I think it may be some type of malware causing the problem.|
Try a quick scan with Malwarebytes
and fix all it finds.
Also, if you have been editing or downloading lots of movies, they take up tons of space...do a search and find your .mov, .mpg and avi files...if that is the problem, burn the movies to data dvds
Some HELP in posting on Computing.net plus free progs and instructions 7 Golds