I have been able to play infantry and scuba, though scuba after an hour died also.. Every time I click Vehicle Challenge It will load I can get to the screen wherein I start walking and within 10 steps it says Windows will tell me if they find a solution .. close is the only option.
I haven't been able to join any Multiplayer games, I started one.. escape from Stratis (?) I was able to walk about 100 paces before it locked up. Didn't even give me an error message, I clicked Alt-Tab and it disappeared.
{F20173} {F20174} {F20175}