Illustrator can't read .ai files?

[Syztum]

This is what appears when I try to open any type of Illustrator file. Does anyone have a fix for this issue? I'm having the same error in Photoshop opening (most) .psd files. It's REALLY annoying and I can't find anything on the internet about this issue either.

[Bill Silbert]

What version of Illustrator and what OS are you using? Also, have you recently updated either your version of Illustrator or your OS?

[Syztum]

CC 2018 and Windows 10. Both are updated and I haven't updated either between the time that this worked and broke.

[Willi Adelberger]

Are you sure that your hard drive is working fine and not damaged?

[Syztum]

All of my other files open. I'm only having problems with Adobe software right now.

[Ares Hovhannesyan]

Is this an image of whole screen or Ai workspace?

[Syztum]

This is just a screenshot of the relevant error message (way too large I know) but there's absolutely nothing else on the rest of the screen so there's no point to sharing that.