I have but all the threads/articles are for errors giving the "A Required device isn't connected or can't be accessed" message. Mine says "The operating system couldn't be loaded because a critical system driver is missing or contains errors"
I upgraded to Windows 10 yesterday, and after messing around with it, I decided to downgrade and go back to Windows 8.1. After the Windows 10 upgrade, I got a message saying that the version of AVG free I had installed would need to be reinstalled. I went ahead and uninstalled AVG through the...