VIRUS has formatted hard drive

It probably just indicated it was an empty volume, I wouldn't worry about it

Do you have another computer you can use to recover files off the infected one?

So you're using the infected one right now? Since using the computer that you want to recover data from can lower your chances of recovering data it's better if you use a different computer to make a bootable CD and use that CD to recover data.

But if you don't mind risking some of your data, you can run the program I linked to on your computer and see what it can recover

Yes after Malwarebytes cleans whatever it finds off of your PC, post that log. Then run the program you downloaded and do a complete recovery.

Here is how you do that:

1. Open the program, select 'Complete Recovery'
2. Select your main partition where everything was stored (most likely C:) click 'Next'
3. Let it scan the partition, this may take a long time
4. On the next screen, be sure the drive you want to recover is selected and then click 'Next'
5. Check off everything you want recovered, click 'Next'
6. Choose where to save these files (pick your external drive), hit 'Next'
7. When the process is done your files will be where you selected to have them saved to

Unfortunately images/videos that you can't open are likely corrupt. Do you have a backup copy of these things?

For locked folders, there is software that can crack the passwords on them, but I don't know of any that is free