Computer virus corrupted all document files

[gvstn]

1. I took a quick look around

And lots of people had this problem in 2013. Even though many didn't get a ransom notice most threads point to it being related to Cryptovirus. That virus encrypts the type of files that you list and then usually would display a message asking for a ransom to give you the decryption key. Cryptovirus was disrupted in June of this year when its servers were shutdown but there could be copycats.

Do you have file extensions showing? I'd want to see if the full name of the file was altered to verify if this could be a variation of cryptovirus. If you don't have extensions showing--In Explorer, click on Organize and then Folder and Search options and untick the box for "Hide extensions for known filetypes" then hit Apply.