You will have to first login back to Windows Vista in case you forget login password. Follow the steps as mentioned in this article and solve the problem.
One of the major problems in Windows is logging onto your PC when you have forgotten your password. Vista allows us to create a “password reset” disk if you forget your login password. You can just press Ctrl + Alt + Delete > Change a Password > Create a Password Reset Disk. Follow the step-by-step wizard and you’re all set.
- Click on Start Pearl and type this in the Search bar: control.exe /name Microsoft.UserAccounts
Classic Control Panel View: Start > Control Panel > User Accounts
- Normal Control Panel View: Start > Control Panel > User and Family Safety > User Accounts
- Click on Create a Password Reset Disk on the left panel.
- Click Next.
You will be asked to choose where you want your password key disk saved. I recommend you choose a form of removable media such as a floppy or a USB disk. Make sure the selected disk is still in the drive, then enter your current user account password.
- Click Next and let Windows do its thing!