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Couldnt register my code composer studio...

I finished almost my registration and this is the first time i am registering. When I enter mac address as it asks..

it says...

  • You have already activated an entitlement for this product. There are no additional activations allowed. If you need further assistance, Click here to contact us.
and also my computer has the address composed of eight, hexadecimal, 2 character fields separated by dashes. But it accepts only six, 2 character fields.I entered last six as the first 2 hexadecimals were 00-00
pls help...