"I am sure that I have installed the new windows at the right drive "
From that statement, do you have more than one hard drive? If yes, why do you have more than one Windows installed? Have you looked for the other installation in explorer? Go to "My computer" and look in there to see if it shows more than one hard drive. Then look for a "Windows" folder. If you have more than one hard drive shown and each has a "Windows" folder, then it could be both installs are still there. But why do you need more than one Windows installed?