Popped open the Disk Management window and realize I have forgotten how to do this.
If it's possible, and I am fairly sure it is as I can remember doing it once before (albiet ages ago), how am I supposed to partition my hard drive without completely reformatting my hard drive again? I feel like an idiot asking the question I used to be able to answer... I guess this is what happens when you stop being a techie and start being a full-time gamer. I've Googled my arse off and haven't found anything except tuts on how to do it during the Windows installation...
Many thanks to those of you who provide me with any information on the matter

Edit: Windows site is bugging me. Tells me to select unallocated section but I can't seem to find one. Further explination of the official Microsoft description is also appreciated if you care to give it...