Hey guys, thanks so much for your replies.
I had a little brain flash last night and remembered a piece of software I hadn't actually installed within this month, but sorted out my login details for it so it would run constantly in the background. That's the only thing I could think of that was new, except a printer (which you had mentioned above), but that was around 3 months ago now.
I've deleted the program and so far so good. I shall let you know of the progress! If it reverts back to it's old ways I'll have a go at everything else you guys have suggested.
Thanks for such a quick reply!
p.s. The program was Raptr btw, I don't know if anyone else has had problems with it before?