Yeah everything is ok now.
I had a Windows 7 ISO, which was unfortunately for Windows 7 Ultimate, while my license was for Professional.
Had to download EFI remover utility to remove the efi.cfg from the ISO and re-install windows 7 Professional and activate my license again.
To be on the safe side, I have taken a backup of the system partition using Easeus Todo Backup. 7.75 GB