Help maybe possibly?

I'm trying to play Left 4 Dead with my friend at his house.

He has Xbox live and I'm trying to sign in as Guest. The only problem is that there's no Guest profile!

What should I do?

Make a new account on it, i remember having to do that to get the "guest" to show up, or mabye i named it guest, but it worked for me and i diddnt need gold or anything for it, Same game too

IF you r trying to run in split-screem(2 players on 1 console)

You need to create another acc. on your friend's console!