How to convert MBR partition to GPT while installing windows 7,8?

MBR stands for Master Boot Record
GPT stand s for GUID partition Table

GPT is not recognized by all previous version of windows require disk space more than 2TB.

Until now, most hard disk's parition table format is MBR, but GPT format's percent is gradually increasing

While Installing windows during partition.
Press Shift+F10. It will open command prompt
type "DISKPART"
type "list disk" it will list all the disks
type "select disk <disk no.> say select disk 0"
type "convert gpt"
or type "convert mbr"   

type "exit" to exit