Are there several versions of Mechwarrior 4: Vengeance?
I am trying to make certain that I download the correct patch, and I don't know how to determine which version of the game I have (presuming there is more than one.)

If there is just one patch, what is the official source URL for it?

I am just beginning the game, and even when the screen shows that I have shifted weapons, my missles won't launch. They launched just fine in the tutorial, but won't inside the campaign.

I also notice that it makes no difference whether I have the Clan MGs highlighted, or the lasers, when I pull the trigger, I get the exact same sound effects and animation...the sound of machine guns, and what looks like a laser blast.

About three minutes into the first campaign scenario, my gun arm starts firing whether I am pulling the trigger or not, and it won't stop firing no matter what I do.

Windows XP Home SP2
Gateway 500 c
Nvidia GeForce FX 5500 PCI (not express) 128MB
768 MB RAM
290 GB space, half full
Pentium 4 1.5 GHz

Saitek 290 Joystick

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I've played this first scenario/skirmish in the campaign a couple of times now....is there any way to skip the intro movie of the three mechs decending and advancing?

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Is there any way to put a "lock" on your weapons so that you don't inadvertantly fire when a friendly crosses your sights?

Thanks!