DHCP troubles after installing Windows Server SP2

I need help!

Recently i installed the SP2 for Windows Server 2003. After that i began to notice that non of my pc is getting IP from the DHCP on the same server….funny thing is that the service is running fine. I’m about to remove the role from the server, and try to install it again, to see if it works. I have been looking for an answer but don’t seem to find one. I’ll appreciate any help. Thanks