I have purchased a new 1tb hard disk which I'm currently using it on windows 8.1, but still my older hard disk contains windows xp which i need to format it and install windows 7 . when i tried to connect my older hard disk in the new pc it beeps out loudly in fear i removed it again i tried but the same result existed and the boot up was not possible . I need to format my old PC and install windows 7 on it using my new PC please help me out guys!!