Tja jetzt endlich Windoof 7 installiert und MW 2 will ja immer noch net und laut Steam-Support nicht legal vor dem 10.11.09.

Zitat : Steam Support
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Question

I am receiving an "Invalid CD Key" error when attempting register my game - what may be causing this error and how can I complete registration?
Answer


Modern Warfare 2 CD-Keys

If you attempt to activate the game before the retail release date, you will receive the message "Invalid CD Key". You will be able to activate your CD Key on the retail release date, currently set for November 10th.