Just been back to the shop and the lad who put the second hard drive in is going to sort things, and I've booked it in for Sunday - he reckons that it needs that program to introduce it to Windows, and he'll give me a copy when I pick it up after he'sed it. Touch wood.

Thanks, people, for holding my hand. Anyway I think I know a bit more about what's involved than before. Mind, that's still not all that much.