How to convert GPT format hardisk to MBR format?

Before doing below activities you must backup your all data  because it deleted your all data from hardisk..All means your hardisk fully clean.
When we face a problem during installation of windows7 in preloaded window8 system.When we install window 8 the hardisk partition change into GPT format but window 7 install on MBR format.
If we try to install there a message always come" your hardisk partition are in GPT style".
There are some rules or steps below, follow it to solve your problem:-
Step1:-First of all you have to boot your pendrive or take a bootable CD of windows  which   you    want to load.
Step2:When Selection drive show in which you want to boot it then Press Shift+f10.
Step3:-A command prompt windows open .
Step4:-Just type"Select Disk 0".
Step5:-Then type "List volume".
Step6:-After that it so drive which you want to change the style of the partition.
Step7:- You have to type SELECT VOLUME volume as you want.                                                                                     
Example:-
                                   SELECT VOLUME E
Step8:-Then after selection a message display volume selected.
Step9:- Then type"CLEAN"
Step10:-Then type"ASSIGN"
Step11:- After these type"CONVERT MBR".
IMPORTANT POINTS:-
 If you convert MBR format to GPT format then you must see below points:
In MBR format you only make 4 partion of hardisk..
In GPT format you make upto 128 partion of hardisk and  it support  upto 18 exabytes hardisk.

After all these process you able to convert GPT style into MBR style.
                 Enjoy!!!