First thing, go to your Aces High folder on your computer and delete the video8.cfg file. This is your video settings.
Now start Aces High. When the clipboard comes up, click on Video Settings. It will detect your video card all over again. Dont use the high rez textures. Set your max texture size to 512 or 256. I'd do 256 first, until I was sure it ran ok, then try 512 and see if it's still playable at that level.
Do not preload anything to video. Preload to system memory only. Close that window and go back to the main screen. Sign in (online or offline, either one).
Go to Options, and then to whatever the graphics settings is called now, I think its the first option. Make sure all those optimize things you unchecked are checked again.
Go have fun.
If all that fails, reinstall.