This is a thread for anyone who is experiencing the game crashing ~30 seconds after startup. I recently called Microsoft Tech Support which aided me on this issue of anyone who is crashing. This help thread is only for people who have Windows Vista.
Please follow these steps
1. Go to my computer, on your desktop
2. Click C: drive
3. Go to Program Files
4. Microsoft Games folder, then click on Gears of War folder (if you have placed Gears of War folder in another location on your computer go to that location and find Gears of War)
5. Look for Binaries
6. Once Binaries is open scroll down until you find Startup application (not startup.dll)
7. Right click on it and click on Run as Administator
Each time you run Gears of War you must Run as Administator to avoid crashes. This solution have worked I was on Gears of War a few minutes with zero problems. If you are experiencing crashes even with step by step help, try updating your video card drivers.
I hope this will help all those people who are experiencing frustrating crashes.