After my recommendations, need to add a word of warning.
I've been having trouble with my hard-drive lately-- as in, I've been running out of space, and FAST. I have a Tb (931 useable space) and really don't do much-- a few games, docuмents, PDFs. Between my wife and I, at any given time I'd ballpark us at around ~300GB combined.
But over the last month, I've found myself with less and less space-- the other night, there was less than 10GB left on the C drive. How?! I went through and deleted as much as I could, maybe 75GB. Still couldn't figure out what was taking up all the space.
Tonight, I checked my disk space-- and there was NONE. Not a single byte. A few minutes later, 18MB. Then 6MB. So I hit google and started researching this phenomenon of disappearing space. Lots of support articles later, and still no resolution. Most of what I found were people who'd lost less than 50GB, immediately on the heels of a Windows update. And in my case, we're talking a missing 600GB+ of space.
So I went through all of my folders and took notes about how much space was taken up. On my profile, about 150GB.
Then I went to my wife's profile, and found that the users folder was taking up a remarkable 750GB. I dove into the folder and after quite a bit of searching, discovered an AVG Web Tune Up Folder... it was 630GB. It was in users>username>appdata>local>packages>windows_ie_ac_001 (appdata is hidden by default).
I honestly haven't the slightest clue what "AVG Web Tune Up" *does*, or how it's different than just AVG (evidently, both are installed). But the amount of space it was taking up was simply ridiculous, and inexplicable. Not sure why it was only on my wife's profile and not mine, either. But I just finished uninstalling every trace of AVG from my computer, and am about to delete this monstrous folder.
I've never had an issue with AVG until this. I don't know how it happened, but in case anyone on the internet ever runs into the same issue-- there you are.