Need help! Black ops not working correctly

[Unseen Assassins]

Hey guys, I've been trying for almost 2 months now to play Black ops multiplayer, it has never worked correctly and I meet all the system requirements, I can even play zombies online on Black ops so idk why its not working on mulitplayer, an error show up that says this.

Error
The Call of Duty: Black Ops is not available at this time please try again later or visit so and so for updates.

I visited the site and it said that Black Ops on the PC was fine

Please help I preorder this game for 75 bucks and I'd really like to play this game again, I never got far into the game because it would constantly mess up, and now I came back to this D:

Thanks!

[MrPwn]

I have the same problem it never happened at my other computer