set up admin pwd on new computer

There is no supported default Administrator password to use here.

For local accounts, the built-in Administrator account cannot use a blank password as a security rule. On many Windows installations, the built-in Administrator account is also disabled by default. That means the password prompt seen from another PC is not something that can be solved by guessing a default admin password.

For access from another computer on the local network, the simplest supported fix is to either:

1. Use password-protected sharing with a valid user name and password on the target PC, or
2. Turn off password-protected sharing on the target PC.

To turn off password-protected sharing on the new computer:

1. Open Control Panel.
2. Open Network and Sharing Center.
3. Select Change advanced sharing settings.
4. Expand All Networks.
5. Under Password protected sharing, select Turn off password protected sharing.
6. Save changes.

If password-protected sharing is left on, people on the network must use a user name and password that exists on the computer hosting the shared folders.

If the goal is specifically to set a password on the built-in Guest account, the documented method is:

1. Sign in with an administrator account.
2. Open Command Prompt.
3. Run:

      net user guest *
   

4. Enter the password, then enter it again to confirm.

If the goal is to use the built-in Administrator account, note these security points:

• The built-in Administrator account cannot use a blank password.
• Best practice is to sign in with a normal local account and use administrative credentials only when needed.

• Set up your small business network
• Local accounts
• How To Set A Password For The Guest Account