Its not a problem though.........
Right now, I am running win 7 32 bit on C drive.
I want to install Win 8 64bit on D drive.
---------Later can I remove Win 7 32 bit from C drive and rename the Drive D to C
I am having an idea but dont know whether it will work !!
Suppose, In C drive i have installed Win 7 and in D drive Win 8. After booting into Win 8, I make Win 8 default boot through msconfig.
then I boot from windows 8 USB, and run command prompt.
then I Format C drive and use Diskpart command to change the name of D drive to C and C to D.
Is it possible to do?