A while ago, I bought Halo 2 for Windows Vista, despite the fact that it said my graphics card was just under the game requirement. It does run on my computer, although not terribly well, but totally playable.

However, upon completing the game (which I done several times), the game goes as normal to the credits, but at the end of the credits the screen suddenly goes black, and I have to reboot my computer. When I run the game again, it tells me I did not properly complete the final level.

Computer Specs:
OS: Windows Vista Home Premium
Processor: AMD Turion 64 X2 TL-50 (2 CPUs), ~1.6 GHz
Memory: 1918 MB RAM
DirectX Version: 10
Graphics: ATI Radeon Xpress 1100

Any ideas?

Upgrade teh Video card and buy a new one for lase

Built into laptop, cannot upgrade.

You can upgrade, but it is always a risk when the people take apart laptop and put togather.

I don't really want to upgrade a graphics card on a laptop as it would just be easier to buy a desktop and I would get better performance too.

However, since I am not currently looking to buy a new PC, is there anything I can do to stop this Halo 2 problem?

I upgraded my video card and I have a laptop.

Try googleing something like "Video Card Upgrade". That's how I upgraded mine.