Based on previous posts it looks like you've been using Hoster for a while. Up until about 3.0 (I think) MTU used upgrade codes that changed with each paid upgrade.
To make a long point short, double check that you are using the original and not an upgrade code. If memory serves original codes start with a "T" and the upgrade code started with "Upg"
You should also be able to double check your reg info from your account.
If that doesn't work I'm out of suggestions because a valid registration code along with the email addy you purchased with should at least get you to the registering online point.
Hope this helps
Sam
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