You would only be able to use the arcade games when signed in to xbox live with your gamertag. Each arcade game is assigned to your gamertag and the CONSOLE it was first downloaded onto. If you use it on any other consoles (e.g. one with a different setup) only you would be able to play them.

It would be whatever your windows live/ hotmail e-mail address is (or was when you first signed up to xbox live)

I can't see an expiry date on my last 12 month subscription card, however you can add cards so that they will start when the last subscription ends. For example you can add two 3 month cards at the same time and they will last 6 months

You can register online and it will tell you if it is in warranty. However if it says its out of warranty you should check the date that it expired, because you are still able to get a free repair on RROD & E74.

To register go to xbox.com

click support

Go to console management tab and click register a console. You will have to sign in using your windows live ID

If the console is in warranty it is covered for 3 years for the RROD & E74, for everything else its covered for 1 year.

Just a thought, few arcade games take up large amounts of space, I would suggest that you delete any videos or music that you have stored on your 360 first. You may have some corrupted items taking up space too, where they never finished downloading but still take up the full amount of space that they would have.

As long as you bought the games with the same gamertag, you can use that gamertag to download them all again. However if you got any arcade games from a memory card/ HDD or the vision camera you will have to buy them.

While I really enjoyed playing underworld, I have to admit that Anniversary is my favourite. Although it didn't remain particularly true to Tomb Raider 1, I felt the boss battles were definitely what set it apart from Underworld.

It shouldn't matter. There isn't any technical reason why installing the DLC first would be an issue, after all you can start a new game whenever you like and there aren't any issues with the DLC.

By opening the 360 for cleaning you have almost certainly broken the seal which MS uses when deciding whether to repair a 360 in warranty. Missing a screw won't matter if this is the case, you wouldn't be able to send it back for a free repair anyway.