I have a win 2003 domain controller and recently decided to upgrade backup exec 9.1 running on it to backup exec 11d. Backup exec wouldn't install as it needed atleast service pack 1. Service Pack 2 is available on the Windows update. My domain controller acts as DHCP server, DNS server, File share to our user. I just wanted to know if SP2 will effect any of these service when I install it.