1. Boot into Windows and turn off 'Fast Boot' in the Advanced section of 'Power Settings'
2. Reboot and select the key that will gain you access to the BIOS - turn off 'Secure Boot' (EFI/UEFI) and make sure 'Legacy' mode is enabled.
3. Boot from your Zorin DVD - launch GParted (Menu | System Tools | Administration | GParted.
4. Delete all partitions on the drive.
5. Close GParted and click on the icon that states 'Install Zorin to Hard Disk/Drive'
6. When you get to install method, choose the last option (something else).
7. Choose the 'advanced' option rather thatn 'guided' install.
8. Once GParted is running again, Create a 30 Gb 'root' partition, formatted to 'ext4' and mark it as '/''
9. Create an 'Extended Partition to the righ of '/'
10. At 'END' of extended partition, create a 'swap area' and make it 4096 Mib (4 Gb) in size - don't look for file type as this is built in to 'swap area'.
11. At BEGINNING of extended Partition, format to 'ext4' and mark as '/home' - this where all the documents etc live - a bit like 'Libraries' in Windows8 - but it includes Downloads too - not like Windows which is frustrating!
12. Finally, at the bottom of the Partition Editor is where you need to place GRUB - be sure it is at the very start of the hard drive ('sda').
Hope this helps!
Keep us posted!
Keep us posted!