Crash/Glitch Weapon issues

Hey all,

 I was on my way to the lab when you're traveling outside. Right when you leave the facility and fight a bunch of guys you walk through a mini base. There was a loading issue which deleted all of my weapons, also put me into a FPS without the ability to see the weapon (when I picked up off of dead soldiers). I'm not sure if the location is that important so I wont expand on that, unless someone asks.

 I just kept going on to see if it would fix itself through a loading screen or two, well, that and I was too immersed to worry about it. I got to a bunker, in which you pick up the rocket launcher ( first one I had found ). When firing the launcher the game crashes. The game also crashes when I try to fire the alternative of the sub machine gun (left click of the mouse). I can pick up grenades, but when I try to throw nothing happens.

 I'm wondering if I should just re-download, or if there is an easy fix.

Thanks

Problem signature:
Problem Event Name: APPCRASH
Application Name: hl2.exe
Application Version: 0.0.0.0
Application Timestamp: 470c11ae
Fault Module Name: client.dll
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 504ecc4f
Exception Code: c0000005
Exception Offset: 00362edd
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 1033
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

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