- Wilis_kid
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- Exalted Heroic Member
Update the GFWL client. If you have the GFWL marketplace on your PC, either delete it or make sure it's updated, then try Halo 2 again.
Port forwarding I can't remember exactly but there are plenty of guides on the internet for that.
As for re-installing, NO. Unless you want the infamous feature to enhance gameplay (In other words, your CD key will no longer work, you have 5 installs per Halo 2 so use it wisely)