Guild Wars installation - wtf...?

I just bought Guild Wars off amazon and installed it.

When I start the game the backround says nightfall.

I didn't buy Nightfall.... I bought Guild Wars GOTY....

My key in the box on the little slip doesn't even fit in the key-spaces...

The Nightfall login screen is for all versions. It's a universal client log-in screen. As for the key, I don't know what the deal is. Go to GW's support page and proceed from there. http://www.guildwars.com/support/