STEAM not working in game

ok so i did the update, and then i went in game and i couldn't open the user interface,im running on vista, so i go out restarted steam, nope still not, then i wondered if pc updates had to do with it, i got out of my game, updated my computer, and bam! i got the community user pannle back (the one were you push shift+tab)

just wanted to let you no

did you have to reboot?

I ran into a new problem on Modern Warfare 2, when I launch multi player it opens in a weird window and its annoying to try to play with. I don't know what the fuck to do. I tried restarting my computer.