help me

im haveing trouble me and my friend r tyring to do a multiplayer session but when i search for the one hes hosting its not there can anyone help me?

See if these help.

http://support.microsoft.com/?scid=kb;en-us;819836

http://support.microsoft.com/?scid=kb;en-us;823630

do we have to regester our games?

When you first install it I think I had to register it. That was a while back but it's a common procedure with MS software.
They are also starting to "sniff" MS Office (Word) and Windows to see if they are legal.
I doubt that they have extended that to "games".

is there a way to regester it because ive had it for a while and i cant remember how to do it.

oh and one more thing doi have to have teamspeak

When you first load the sim they (MS) ask for the serial numbers.

Teamspeak is very good if the server supports it.