BACKUP!
CREATE PARTITIONABLE SPACE
PARTITIONING
Start->Computer->Manage
->Disk Management->
Shrink a volume that is free
Windows 8
Only 64 bit will work.
Select Language

Install Ubuntu

Select Language

System Requirements

Create Partitions

Select 'free space'->'Add'

Select 'free space'->'Add'
Select 'free space'->'Add'
Title

Follow the onscreen instructions.