Cannot log into windows live in gears of war.

Im having a big problem with Gears Of War it is some stuupid problem..
I got windows vista and game works nice
Now im gonna go to the problem :
When im gonna log into windows live it says : The profile coudnt log on to live. This can be problems with the network Or it could be that the Windows Live ID service is unavaibible.
What the is this !!!
I would be glad to get answers. :)