Hi. I have a 2012 HP Ultrabook. Want Windows8 and Ubuntu dual OSs. Windows8 came pre-installed with 5 partitions. My understanding is only a maximum of 4 inclusive of Ubuntu is OK. Below is a screen shot of 'Disk Management'. How should I proceed? I understand the concepts of reducing sizes of, and creating new partitions, but am scared of breaking Windows 8 by reconfiguring these preinstalled partitions.

Preinstalled Windows8 partitions.jpg
The Ubuntu I'm planning on installing is 12.04.2. Just in case, some computer specs are below:

Thanks for having a look at helping me out!

Operating System
Windows 8 (x64) (build 9200)
Install Language: English (United States)
Installed: 26/02/2013 11:32:19 AM
Processor a
2.40 gigahertz Intel Core i7-3517U
64 kilobyte primary memory cache
256 kilobyte secondary memory cache
4096 kilobyte tertiary memory cache
64-bit ready
Multi-core (2 total)
Hyper-threaded (4 total)
250.93 Gigabytes Usable Hard Drive Capacity
144.84 Gigabytes Hard Drive Free Space

Local Drive Volumes
c: (NTFS on drive 0) * 228.66 GB 142.09 GB free
d: (NTFS on drive 0) 22.27 GB 2.75 GB free

Operating System is installed on c: