DNS question

Greetings,

I have recently had an issue with the dns address on a windows xp
professional workstation... some background.

I have a windows domain environment, with sbs server 2003 R2 and 20 XP
pro workstations.

My work stations point to the server for DNS in the network settings
tcp/ip dialog box. My ip's are all static, as well as the gateway.

A recent virus/malware renamed the dns address to some address in
russia. how can I lockdown the dns settings so that no program,
malware, etc. can make changes to it. I assume something at the server
level in group policy can handle this, but need some help in getting
there. Anything is greatly appreciated. Thanks.


-thebluefox