Unblock internet access

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I have XP.

I installed mechwarrior 4, and the internet thing popped up, telling me that mechwarrior was trying to access the internet, I chose Block. I now want to unlblock it, but I don't know how to. 

[Tezuka]

Goto Control Panel and then into Windows firewall and go into the 'Exception' tab. You will see Mechwarrior untickied, tick it and press OK.

[Roph]

Or just like, stop using windows firewall =)