For this exact reason everyone should have at least 2 administrator accounts on their computer regardless of operating system. One is used for every day activity and the other is for moments such as this. The accounts can have the same password if you so desire so you don't forget it because you have not used it in months. You just have to remember the user account name.
If one account is deleted then the other account is still available to log into the system and recreate the original account.
VG
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