The next screen will will identify all the windows installations and highlight in my case Windows 7 which is installed on C: drive select Next

Select the Command Prompt 

Follow the steps given in the Command window bellow:

1. switch to Windows\System32 and copy Utilman.exe Utilman.exe.bak ( this is just to create a backup file of Utilman.exe)
2. then the most important step Copy cmd.exe  to Utilman.exe as shown below copy cmd.exe Utilman.exe then you will get a prompt say yes by ‘y’
3.  You should see a confirmation that one file copied
4. Restart the Server or in my case Laptop.

Once the Server/ Laptop  is rebooted press Windows key + U or click on the icon of Utilman, and you will see the command prompt.

give the following command to change the administrator password

net user administrator * (if your administrator account is renamed you can give that user name as I have given Ibrahim.quraishi below)

you will asked the enter the password ( the characters will not appear but dont worry as it will not show for security)

yo will be asked to reenter the password again as a confirmation.
Then you should be able to use the new password which you have set for the Administrator to login to the server.

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