boot from drives and format

hi
i want to boot windows7 from my harddisk which i am using .
i mean to say that not from external hard disk drive.

i will try to explain again, actually i have a pc on which i am working at this time (internal or primary harddisk drive of it ). i want to reboot my system and when its bootsup then it should be stating setup of win7 from one of my harddisk drive. for example from d: drive (D:/win7)

and also want to fromat my c drive.

Copy Windows 7 setup files to the external disk drive.

Run Windows 7 setup from the external drive.

Be VERY careful to select the INTERNAL drive as the install location.

When you select the INTERNAL drive as the install location, click the DRIVE OPTIONS.

You can format the C drive at that time.

i want to install windows7 from hard dirve but from booting process , like when we try to install from a DVD , we just started computer and go into the option of booting process and setup continuies. liike this.
i want to do it from my same harddrive instead of DVD.

mehmood, I am confused about your "Windows7 backup" I believe that I saw you over at MaxPC when you installed the beta. Are you trying to save your data - and do an upgrade?

Or - do you have the install ISO (Windows7 backup) on the D drive and want to install to C or install to D?

I'm sorry. I do not speak Urdu or this would be a bit easier.

You can install 7 to either drive. I think you are asking what to do with the ISO.