If you have purchased a computer from a pawn shop and it is locked with a Windows 10 password, the situation can be frustrating but not impossible to resolve. Here are some steps you can take to unlock a Windows 10 computer:

1. Reset Local Account Password: If the password prompt is for a local account, you can try using password reset tools or booting into Safe Mode to reset the password.
2. Use Password Reset Disk: If you have previously created a password reset disk, you can use it to change the password and access your computer.
3. Online Account Recovery: If the computer is linked to an online Microsoft account, you can try recovering your account password through the Microsoft website.
4. Factory Reset: As a last resort, you can perform a factory reset on the computer to remove the password, but this will also delete all data on the device.

It is important to note that unlocking a computer purchased from a pawn shop may raise security concerns, so be cautious about the origins of the device and ensure that it is not stolen property.