Hmm, just tried that from here Arduino Forum didn't work. Thanks for recommending that though, never had heard of it but it's a good thing to know about for the future.
But! I've found a new lead. When I plug in the USB cable it beeps twice, which I just found out means the correct drivers are not installed. I guess I'll have to delve a little deeper into getting those installed, though I'm on an older PC running XP.