Right, So I actually did something similar. On some version of windows I noticed that ctrl-backspace was adding another character to the password, instead of deleting it. So I included it in my password. Then I updated to a new version of windows and got locked out since they updated the password backend to where it would actually delete the password instead of a adding the character, so I had no way of typing out my password. Ended up just nuking the computer.
Right, So I actually did something similar. On some version of windows I noticed that ctrl-backspace was adding another character to the password, instead of deleting it. So I included it in my password. Then I updated to a new version of windows and got locked out since they updated the password backend to where it would actually delete the password instead of a adding the character, so I had no way of typing out my password. Ended up just nuking the computer.