Well bugger me sideways with the rough end of a pineapple
Thanks for the suggestions ter_roshak and demonbane.
I still can't get the f*****g checksum out of the gentoo iso's that I downloaded yesterday
and for the life of me I can't work out why (other than the obvious, i.e. being a stupid bastard!
I'll probably just burn them to disc and give them a try. If nothing else, I'll learn a little of what it's like to install the gentoo. If I end up having to download it again, then "whoopedyshit"!