Sorry to ask a dumb question, but I wasn't able to google it as I would normally because of the ambiguity of it. There's no way for me to ask this question without Google thinking I'm a total noob, which maybe I am for not knowing this, but it's just a matter of me not really knowing how Windows 10 works.
Yes, I've had it for a long time now. But I ran Windows 7 before Windows 10 was released and it was an upgrade to Windows 10 rather than a clean install.
So, down to my actual question. There are three Windows folders here: "Windows10Upgrade," "Windows.old" and "Windows." The reason I'm asking is because I just noticed how low the space on my C drive is. I have a 2TB harddrive partitioned into 200GB and 1.8TB on separate drives, as advised by my computer guy for backing up files or something. I'm now down to 50GB on the 200GB harddrive and I've noticed that, obviously, the Windows folders are taking up the most space on this drive.
Is it safe for me to delete any of them to save space? I'm sure I need at least one of them to run the OS or something, but do I really need all three?