If you are referring to the Alien Blaster, you need to take the trait 'wild Wasteland' and head North past New Vegas, near the Tumbleweed ranch (a bit East of that).
If you mean the orbital laser, you need to finish 'That lucky old sun', set the power to ARCHIMEDES II and get the rangefinder in Freeside.
Occasionally Fallout: New Vegas will freeze, but not as frequently as Fallout 3.
fallout: new vegas 2 I've heard.
Fallout: New Vegas
Fallout New Vegas is the fifth installment in the Fallout series. It is for the Xbox 360, PS3, and the PC.
Fallout new Vegas
No, you can't get married in Fallout: New vegas, but you can have sex in the game :)
fallout new Vegas will be on PlayStation 3 and Xbox 360
In my opinion, Fallout 2.
There isn't one
if you mean rex you get it when you recruit him
Broc flower cave.
Nope. Fallout 3 and Fallout: New Vegas are completely different games, sure they are in the same title and the same game engine, but the configurations and in-outs are different for both games, so you cannot simply apply a mod you used for Fallout 3 and try to run it on Fallout: New Vegas. You may be able to find mods that match your Fallout 3 mods for New Vegas on an assortment of different websites all over the net.