Borderlands - Problems loading Mad Moxxi and Zombie Island

Hello,

1)

I have purchased Borderlands through Steam. I have also purchased, downloaded, and activated Zombie Island and Mad Moxxi DLC through Steam. While playing Borderlands if I try to load Jacobs Cove (Zombie Island) or Mad Moxxi's Underdome the loading screen just keeps loading and does not go away (this is screen where there is a picture of the level and a random fact about the game is displayed at the bottom). If I press ALT-TAB and then go back into the game it asks for an Activation Key. I go into Steam and copy the activation key for the specific DLC and then paste it into the activation window then the message that comes up, about 3 minutes later, saying there is was an error activating and then the game crashes. In the past I have been able to play Zombie Island and Mad Moxxi with no problems at all, this started happening about 3 days ago, after not playing the game for a few weeks. I have the update for Borderlands that releases February 2, 2009.

2) Another problem I am having is that the introduction screens do not load. For the introduction 2K video and the Nvidia Video I just here audio, and then the main menu of the game loads. Other then two problems mention I am able to play every other aspect of Borderlands perfectly.

Since I have observed these problems I have uninstalled and then re-installed the game and I still have the same exact problems. My computers specifications are as follows, Windows 7 Ultimate 64 Bit, core 2 duo 2.2 ghz processor, 4 gigs ram, nividia 800m GTS. Any help with these two issues would be greatly appreciated thank you.

Gearbox: Borderlands Forum

SecurROM: Borderlands DLC FAQS