How to install Window 8 alongside Ubuntu
To have Ubuntu and Windows Operating Systems together in dual boot, the recommended way is to install Windows first and then load Ubuntu. Because Windows always requires the first partition, and if is installed after Ubuntu, it would overwrite the boot loader (GRUB) of Ubuntu and you might not find the Ubuntu installation at all.
The solution to this problem is to recover the Ubuntu Grub loader.
(a) On your machine after having finished installing windows, boot from Ubuntu Disc.
(b) In the menu that appears on booting, select the option " Install and Run Boot Repair".
(c) Then click on "Recommended Repair" After it finishes its operations, reboot the system, the Grub menu with options to use both operating systems should appear.