Plesk Windows Root Password can also be retrieved and reset with the help of the plesksrvclient binary located in the %plesk_bin% directory.
Open your Windows Command Prompt and type the following command and hit the Enter button:
cd %plesk_bin%
It will enter in to the directory where the Plesk’s Bin folder is located.
In order to get the existing root password, enter:
plesksrvclient.exe -get
It will show the existing password on a popup window. To copy it on clipboard click the Ok button.
To set a new password, enter above command without “-get”:
plesksrvclient.exe <NEWPASS>
It will enable you to insert a new desired password for your Plesk Admin login.