For PC without UEFI

Method 1

• You can try EasyBCD




• Download EasyBCD here [Just type any name or email-id and click "Download!"]




• See instruction using EasyBCD

If your PC have UEFI following will work

Method 2

• Intall Windows 8


• Download Boot-Repair Disk here and burn it to any disk.


• Boot that Disk and click "Recommanded Repair".

OR

Method 3

• Install Windows 8




• Create Ubuntu USB Disk using iso that you have used for installation with storage



• Open terminal and run sudo apt-get install boot-repair

launch Boot-Repair from either :

• the Dash (the Ubuntu logo at the top-left of the screen)




• or System->Administration->Boot-Repair menu (Ubuntu 10.04 only)




• or by typing 'boot-repair' in a terminal




• Then click the "Recommended repair" button.