Avast server with SBS 2003

Hi…i have a server whit SMS 2003 and i have installed the trial version of Avast server. In my server…i have 2 network card…and i have remove the trial version and since that,…one of my card giving me a bad ip…169.234…

My local ip 192.168.16.2 ( sbs ) and my modem is 192.168.16.1

My problem is now…no one of my desktop ( 6 of them ) is able to connect to the net and only the server is able to connect to internet.

I want to know if something happend in my dns or dhcp when i unistalled the Avast…

thanks

Buzz