You'll be asked for it when you start the game, and sign into Windows Live. Just type it in there, and press Enter.
There is no more a master key in Fallout 3.
yes
At the fallout 3 website (www.bethsoft.com) download the geck to make mods!
Yes, you can install Fallout 3 PC mods from Fallout Nexus onto the PS3. For a tutorial, see: http://fallout-mods.blogspot.com/2010/11/fallout-3-mods-for-pc-on-ps3.html
contract killer perk
shortly put, no.
You do not need a key to open the vault. All you need to do is go to the blinking box next to the door and it will say to press a button to activate it. When you press the button then you will hear a siren and it will open the door.
there is no key it opens at the end of the game ps. there is no benefit getting in there... its just a room
there is a bunch so go on youtube and put that in
Yes when brought from a shop, all you do is put the disc in, install the content then play the content using the original fallout 3 disc.
You shoot the person with the mesmetron, talk to them, and there will be an option to put the collar on.
Occasionally Fallout: New Vegas will freeze, but not as frequently as Fallout 3.