|You can remove the Vista administrator password on command prompt with an available admin account to enter safe mode first. If you have another Windows Vista admin account, try these steps below:|
Step 1: Press F8 when your Windows Vista PC is booting. You will come to the Advanced Boot Options. Then choose Safe Mode with Command Prompt and press Enter.
Step 2: Enter safe mode with an available admin account.
Step 3: Type "net user" and press Enter. The command prompt will show you all accounts on the Windows Vista PC.
Step 4: Type "net user Paul 123" (Paul is the locked admin account's name and 123 is the new password) and press Enter. Now you have successfully created a new password on the locked admin account.
Step 5: Type "shutdown -r -t 00" and press Enter.
Your Windows Vista PC should be rebooted automatically and then you can logon Windows Vista with the new password.
If the method above should not work, you could use some third party windows password recovery software, for example Windows password key 8.0.