Well, I've used it since yesterday and found out that my SYSTEM VOLUME INFORMATION folder is the problem. It went from 14GB to 25.6GB in less than a day and I can't find a permanent solution to treat this problem. So far, the only thing I know how to temporarily treat it is to retart my computer. And by doing so, for some reason, it clears a lot of the space it took up.
A few forums said to change the System Restore space capacity, which I did (from 12% 6286MB to 10% 5068MB) but the folder is still growing in size.
Any help would be GREATLY appreciated!