1. Open Command Prompt,
(If you have Windows Vista, Windows 7 or windows 8 then you have to run command prompt with administrative privileges etc. Run As Administrator)
2. Go to eScan Directory and execute Chanpass.exe
3. You will have to enter Windows Administrator account password .
4. Now Select Root User and click Next
5. Enter new password for Root User and click Change Password.
It will change Root User Password.
Refer below link if you get any error while changing root password
Unable to change webconsole's Root user's password, Error: Invalid object name "User_Details
"Invalid object name "User_Details"