Okey, I've been playing for about 160 + hours on Mw3.
I didn't upgrade the computer at the first 100 hours, but after I upgraded the computer at 140 hours, i made it to play up to 155 hours.
Then I upgraded once more with more cooling and new SSD disc and cooling, new chasis and shit.
So the problem is, after all the upgrades, I wasn't able to connect, it said it wouldn't connect to the online services, a few times i was able but it wouldn't start playing after reaching 99% loading after connecting to a host. so two different crashes or failures as you may call it, after many attempts I tried to re-install the game, which means downloading it from the Steam Library which took me about 6 hours.
When it was done, I was able to play the game, connect to the services, connect a host and play the game.
But after a single restart, it wouldn't start connecting the service, and i restarted it, started it as administrator, tried once more and it didn't work so i quit the game, and suddenly an update appeared in front of me on 5 MB.
Steam downloaded it and installed it, i was able to connect to the services but when i did try to join a game, it crashed at 99% loading.
the crashes ain't giving me crash report or something, it just stops. loads normally untill it reaches 99-100% loading, and just stops the game.
What's wrong, how can i fix this? I don't want to spend 6hours downloading each time i want to play this god damn game.
MW2 is not a problem to play, it just starts and joins a game and does what it usually do.
Have you updated your bios, have you installed the latest drivers for your devices. and I would verify your game files in steam that will check if you have the latest patch for the game and bring it up to date.