Can't activate Avast 5 IS :(

Hi guys

I installed Avast 5 and tried to activate by clicking Maintenance → Subscription → Purchase Now → I already have a license, but I can click till I’m blue in the face and nothing happens. Clicking Remind me later also doesn’t do a thing.

I’m running Windows 7 64bit build 7057 because I haven’t had time to install my retail Home Premium 64bit yet.

Has anyone else had this problem where you can’t click “I already have a license”?