1Things I have checked which didn't help / show signs of issues;
CPU & GPU temps.
Memory, CPU, Networking, Disk in Resource Monitor prior to loading Arma and directly after freeze with no obvious issues.
Clean reinstall with no mods.
Lowest graphic settings.
Closing all background programs.
Running as Admin.
Reducing Win7 Aero Visual Effects (note sometimes windows will ask "Do you want to change the color scheme to improve performance?" so by default I remove the color scheme when Arma 3 runs.)
My PC Spes;
GeForce GTX 650
Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz
8.00 GB RAM (7.95 GB usable)
1920 x 1080, 60Hz
Windows 7 Home Premium 64bit
Dump Files & DxDiag https://onedrive.live.com/redir?resid=1FF75924FC220F6E!715&authkey=!AC1mdogDZOfAX4Q&ithint=folder%2crar