So I had PC in Safe Mode for roughly 3 hours without any crashes. Then I rebooted and created another account on this PC for my dad as a "standard user" (non-admin) and he used it for about 30 minutes mostly browser, pdfs etc... and have PC up/idle under his account for additional 45 minutes so total 1 hour 15 minutes without any crashes... I am not jumping on any conclusions yet but will try to run it for another hour or so before reporting back here and if it stays stable will log back into my account (admin) to see if it crashes. Again on my dad's account eventhough it hasn't crashed for 1 hr 15 mintues doesn't really mean anything because it could be that he's not using same applications i used but to be honest, i just installed OS yesterday so besides, printer drivers and utility, mozilla firefox and couple other utilities (CPU-z, Apple airport utility, MiniDump viewer, Adobe Reader, etc...) I don't have anything installed anyway.