Welcome to the forums Poenewbie,
Could you attach a copy of your output_log.txt file (see MUST READ... for where this is) ideally both with and without /3GB enabled? That would allow others here to check whether something else, other than memory, might be causing your problem.
When you say the game "doesn't load" with /3GB, what exactly happens? (any error reported, do you reach the main menu, etc).
Hi, I'm now attaching the log file without /3GB.
output_log.txt
And below is the log file with /3GB.
output_log.txt
With /3GB enabled, after I double click on the icon to launch the game immediately a popup message box appears saying the game has crashed. I don't even get to the Obsidian intro screen.