Had to reformat and reinstall everything.

[pocaracas]

Did you ever install some sort of hard drive encrypting software... like bitlocker?  
Bitlocker is a legit piece of software that M$ integrated into Windows: https://support.microsoft.com/en-us/wind...1561aae838

Maybe you or someone with admin rights activated that for the boot drive the day before things went awry and forgot to tell you the code?
It's too late, now, but that could have been an option.

Another option is some malicious code activated it for you and then asked you to pay up (possibly in bitcoins) so "they" could give you the code.
If you feel this is what happened to you, my advice is to, from now on, use a better anti-virus than the one shipped with Windows. The Windows one isn't terrible, it's just not that great.
Don't use Norton, that thing is a virus in itself. Use Kaspersky, Avira, Bitdefender... and can't remember any other decent ones (tbh, I haven't looked into the anti-virus market in a while, so there may be newer/better ones around)

No, I didn't see any ransomware. I use Malwarebytes. 

I am just pissed because I lost my screenshots of my responses on social media from celebrities. Fortunately I do have printouts, but I do need to frame them.

I once lost a few years' worth of college work... luckily, it was past years, so it was fine.
That's when I installed Dropbox and I've been using it since for the important things.
From M$, you have their OneDrive which is similar.
And there's also Google Drive.
And you can use all of them for some extra cloud space, or for redundancy.