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DNS IP changed

Q: I have a network that has a small business server 2003, 2 XP Pro, 1 Win2K, and a PC running vista. This has been in place for about a year and everything has been running just fine until about a week ago.

Here is what’s happening: The server has its IP addresses hard coded, Its also the DHCP server. The internal IP Addresses are 192.168.17.x. The server is .2 and is setup as the DNS, WINS, & DHCP for the other PC's.

On the clients they get their IP address from the server and 5 to 10 min later the DNS server changes to 192.168.1.1. I can do a IPCONFIG /RENEW and reset the DNS to 192.168.17.2. Then sometime later the DNS changes back to 192.168.1.1. I don't notice this till I try to access the internet and everything slows down.

I have run Symantec AV, Microsoft Safety.Live.Com, and Trendmicro.  none have found anything. No Virus, no spyware, nada.

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