Compute Engine generates a random password, but you should change the password to a custom password that is meaningful to you. To set a custom password:
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Connect to your Windows instance using the generated password.
 
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After the desktop finishes loading, click the Start menu icon.
 
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Click Control Panel.
 
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Under the User Accounts icon, click either Change Account Type or Add or remove user accounts.
 
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Select the account that you want to modify.
 
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Click Change the password.
 
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Enter in your current password and your new password.
 
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Click Change password to save your changes.
 
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Test that your new password works by disconnecting and reconnecting to the instance using your new password.