Steps:
1. Click Windows icon and Click Control Panel
2. Click on System and Security.
3. Click on Administrative Tools.
4. Double Click on Computer Management.
5. Click on Disk Management.
6. Left Click on partition that you want to re-size (shrink or extend).
7. Want to shrink volume of disk 0 on "C" partition, so click shrink.
8. Enter the amount of space to shrink, windows 7 already give maximum size to shrink, so we can only reduce the size.
9. Click shrink.
10. Now we have unallocated disk space to create a partition, left click on unallocated disk space and click new simple volume.
11. Wizard for creating new simple volume will appear, just click next.
12. Type size of partition we want to create, and click next.
13. Assign drive letter for partition, and click next.
14. Choose format of partition (choose NTFS), and don't forget to choose "perform a quick format" to format partition quickly, and click next.
15. Click finish to complete creating partition, and new partition already create.
