Oh c'mon, not CH000172, this is NOT a lost or forgotten password, this is an account which has been deleted by the user, the original password is known but seemingly cannot be applied because the account has been deleted.
Is there any way to access the system to reinstate the user account?
Trying to boot to Safe Mode is not possible because the user password must also be entered.
I have various tools available, UBCD, EBCD, Knoppix, Ubunto - will any of them help or should I go straight into a format/reinstall after recovering files?