Yeah. MetaTrader is free; therefore, metatrader is not the problem.
The activation error you are getting is most likely from the expert you are using.
You need to put the right key to use that particular expert with metatrader.

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good evening everybody.
I can't get started with Meta Tader 4, I am having the following message all the time:
Your Key is not valid. Please activate your copy.
Your expert ID=943141941
If ExpertID is 0 first check the EA settings.
Turn on ALLOW DLL IMPORTS and
remove CONFIRM DLL FUNCTION CALLS there.
Also check the global parameters of the MetaTrader:
Tools -> Options -> Expert Advisors.
Turn on Allow Dll imports
and turn off Confirm DLL function calls
Then restart the MetaTrader
Any ideas???