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C drive filling itself

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Hi, lat last night I was using my laptop and I suddenly got notification that my C drive was running out of storage space. Seconds later, the message changed to say that I had indeed ran out of storage space. I have 285 GB of storage space on my drive, which are apparently completely filled up, but when I select all folders and files visible in the C drive and right-click it tells me that I have only selected ~23 GB. (I'm viewing hidden folders and files, too). I've been searching and searching all night and morning for the culprit; I've run disk cleanup, disk defrag, an intense virus scan, and have been manually searching through subfolders on my C drive. I think I may finally have found the folder containing all of this storage usage, but I'm not sure what is the proper way to deal with it. A subfolder under C:\Users\Public\Documents\PC DM Files seems to have tens of thousands of folders containing dozens of files each, and each seems to mention something about a backup. Lots and lots of .dat files. I'm hesitant to delete anything that claims to be a backup file, but this is causing huge difficulties for me, how should I proceed?
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If your C:\Users\Public folder is Shared, sounds like someone else with access to your network may be storing their .dat files on your hard drive.

If your C:\Users\Public folder is not Shared, are you sure you don't have some kind of auto-backup type program running?
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