Sabotage via Vegas 1 and 2 !!!!!!!

[MARKONE]

...since I downloaded them the other day when the sales were on > now L4D 1 and 2 don't work on multiplayer - this has never happend before by the way and this is definitely related.

Any ideas please ?

Cheers !

[AlHudson1]

I don't know I have Rainbow Six: Vegas 2 and Left for Dead 1 installed in my machine both work.

Try to backup your games (Rainbow Six) an then uninstall it... check if L4D starts to work again.