HOW TO CONVERT MBR TO GPT?

Convert your MBR partition to GPT using command Diskpart

  Warning : Backup all your data (there is chance of you lose data)

1  Open command prompt(win+r) and type in DISKPART and press Enter

2 after entering into diskpart mode type in  list disk(i.e diskpart>list disk)  

3 number of disk will be listed.

4 Then type in  cmd select disk (i.e select disk disk 0)

now your disk has been selected.

5 Finally, type in convert gpt into cmd

your hard disk partion would be converted into gpt...

NOTE: while installing windows if you want to convert mbr to gpt then when error occure( i.e convert to gpt to install windows ) press SHIFT+F10 and then cmd will pop up after that do the same process explained above.