content: Account Deleted By User I downloaded this free software to find out where all the data was hiding.  http://www.uderzo.it/main_products/space_sniffer/index.html Pretty cool actually.  In about 3 minutes I had determined the culprit. Firefox Profile folder / cache. It even had another folder in there called cache2. 850 FUCKING GB (My son watches Sesame St videos and Yo Gabba Gabba almost exclusively.) I know the caching for firefox was on, but I assumed there was a limit.  And it sure does not seem to make thing faster or slower one way or another. I'm not the type to jump to conclusions and see a conspiracy or something nefarious.  Anitvirus is functioning.  Anyway my solution was to uninstall firefox for good.  Now for the 850GB folder .. you can't just right click and choose delete in windows because that would slow your operating system to a crawl for a solid week.  No .. the best fastest way is through the command console. Navigate to the folder and you know Del . /F /Q /S :>NUL  where NUL hides output to the console..  reducing the time it takes to delete by 25% or so.  Long and short ...  it took 84 hours to delete the folder.  and with no output, to check and see if it was still working I kept checking the properties of the C: drive every now and again. But on the plus side since the command console was running in the background my son was able to use " chrome " to watch his videos no prob.  Fun Stuff.. check out spacesniffer if you haven't .. pretty neato.