Re: Linux
@ Bloodbeastterror
James 51 makes a sensible and safe suggestion on the choice of *distribution*.
I'd go one step further and suggest the purchase of a refurbished laptop as a throw away machine while experience is gathered. A core-duo class Thinkpad (e.g. x200) can be had for £90 or so on the well known auction site from one of the suppliers who sell ex-corporate machines ('buy it now, 10 or more in stock, 128 sold' or similar). These come with a Windows 7 Home OEM installation targeted at recycled computers so you have a way back. Explore using a 'live' session before installing.
I'd also suggest investigating clonezilla (a bootable linux designed to run from USB stick or CD that can be used to image an entire hard drive to an external hard drive).
Have fun. It is a whole world.