im having the exact same problem jsallo.
very similar specs, just my mobo is an MSI board.
everything works fine for a little while, nothing extra going on in the background,(firewall OFF, etc.) just let LW run. after a few minutes it hangs saying it is out out memory or some such, cpu usage at 100%, only thing i can do is end program from task manager.
only thing i have changed on my system is upgraded to the latest LW (4.10.5)
very frustrating