I'm trying to paste a public key into PGP v8, but a message keeps saying that PGP cannot copy a key from the clipboard, i've checked the help file but can't find the problem.
Any ideas would be welcome.

You've answered your own question, the 'paste' function takes the value stored in windows clipboard, the programme has to be designed to accept this interface. If it's telling you that you can't paste from the clipboard then you just have to type the key in yourself

Sorry I never explained properly, according to the help file you add public keys by pasting it into PGP, but this function doesn't seem to work.