When I first started to play FO3 on my old desktop, all my achievements were registering on X-box live under my account. Now that I have a new desktop, none of them are registering on it. I noticed that I can't log in when I start up the game on teh main screen. Am I doing something wrong?

Are you running the game with FOSE? If so that disables the Live functions.

No I am not, at least I don't think I am. I'll have to look.

I am not using FOSE. Is there something in the settings? Do I need to be logged in on the website?

Anyone else having this issue? Do I need to delete all the contant and reinstall it? I am running it through Steam.

I read somewhere that entering a cheat code (possibly any code for that matter) in the game console will stop registering achievements. Now I have looked on Xbox Live's website and it was registering the game till 8/1/11. Since then, I have removed the game (through the uninstall program and through just deleting everything). I just started a fresh download and started playing it yesterday and it still does not register on Xbox Live. Does this sound like something with the game, Steam, or Xbox Live?

I was finally able to log in. It took some time but Games for Microsoft-live finally linked to my xbox live account and it is working again.