Created an account to post troubleshooting I did to fix my crashing issues. Maybe it will help others I've seen with similar issues. Try these one at a time til you figure out whats crashing it.
1) Disable any overclocking that you have setup (CPU/GPU)
2) Zone Alarm & Ariva free antivirus disabled or uninstalled. This did not apply to me but read on multiple threads of these causing crashes.
3)Go to arma 3 installation folder (default install location 64-bit c:/program files(x86)/steam/steamapps/common/arma 3) right click the arma3.exe go to properties, click the compatibility tab then click the box next to "Run this as an administrator" then click ok.
4) Create a shortcut to arma 3.exe (default install location 64-bit c:/program files(x86)/steam/steamapps/common/arma 3) right click go to properties, then at the end of the target line add -nobenchmark (make sure to put a space before the dash) This helps with computers that cant handle the high default video settings. If that doesn't work replace -nobenchmark with -winxp.
5) Make sure your directx is up to date
6) Install the beta drivers from your video card manufacturer. (V13.2 for my ATI card) I believe this is what fixed mine, I went from crashing every 5-10 mins to not a single onein 2 hours.
ATI - http://www2.ati.com/drivers/beta/AMD_Catalyst_13.2_Beta7.exe
Nvidia - http://www.nvidia.com/Download/Find.aspx (make sure to select beta in the Recommended/Beta: section.
I hope this helps somebody. Post any other fixes that may help someone and let me know if I need to correct anything.
_Solus_