it wont open anymore, help me please

[CaptainBlue]

ok, i tryed to open up halo pc and halo ce, but it does the HALO loading screen, then just goes back to my desktop. the only thing i can think of, is i just downloaded counterstrike source, windows service pack 2. and i read someone say that xbc doesnt let gamespy arcade work, and today i opened xbc for the first time after installing halo ce, so can anyone help me?or has this happened to you as well?what can i do to fix it?


please dont flame, just post if you have a suggestion or something that could solve my problem.