Empire wouldn't let me signup, what the hell?

[Stosh]

Hey all. I just tried signing up for Empire, which I've never had an account at, so I could receive rakeback which I didn't have at Party. I did this at my uncles house on a clean computer which has never had anything poker on it at all. I used an email address that was brand new, and with a screenname that didn't resemble my Party Poker one at all. The pop-up box from Empire said that I already had an account, and to help prevent collusion, I couldn't sign up. From everything that I've read on 2+2 etc, I followed the necessary steps to avoid a situation like this. Can anyone give me an ideas how to get around this? I need rakeback badly. Thanks. 'Stosh