I also have a low end system I am trying to test.
When I get that particular error message, it is because I chose the wrong video settings for My system, usually something not similar to my desktop.
Go into the AHII/settings folder and find the file "video8.cfg" . Delete it and restart the game. You should get the video setup screen on startup. If I start with My desktop settings, I can get the game to start, and get onto an airfield.
For Me it is real slow, perhaps five minutes or so to get into the offline mode. At first I thought My Computer froze and just rebooted it. I got distracted the 2nd time and left the puter for a few minutes and when I came back, AHII was up !!!
I am still experimenting, but have not gotten above a 0 FPS yet.
While My FPS is 0 so far, I can move around if I am very slow with the mouse pointer, and be as precise as possible in placing it.
I hope this helps you.
NOTE : DO NOT USE THE PLUS / MINUS KEYS ON CLIPBOARD TO RESIZE IT, TILL YOU GET A +1 OR BETTER FPS. It's very hard to place the point of the curser correctly to activate them.