How to do hard disk partition without formatting process for window 7 premium

You can do as followings:

1) ri8 click on my computer.

2)go to manage.

3)go to drives nd hardisk.

4)if u have nly 1 drive c thn ri8 click on it say shrink volume.

5) keep c drive upto 40gb and rest will be available as free space.

6) thn click on free space and say make new volume. Select suitable size of drive.
 
7) follow same procedure for creating multiple drives IMP-MAKE SURE C DRIVE IS 40GB.

But you also can download a partition manager tool from http://www.disk-partition.com