DHCP assigning wrong DNS IP address

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I'm somewhat of a newbie to networking and I've encountered an issue.

My company recently switched ISPs and as a result we have a new public
IP address. During the whole ISP change the internal/private IP
address for our DC got changed as well from 192.168.0.11 to
192.168.0.2.

Both DHCP and DNS services are running on this server (W2K). I've gone
through the necessary steps and updated the NIC to reflect the new
private IP address. I've also updated the DHCP Scope and Server
Options to push the new private IP address for the DNS server.

Everything was fine for about a day, then random workstations in our
network started receiving the OLD DNS server address of 192.168.0.11.
As a result, they were not able to connect to the network or browse
the Internet. As of right now the workaround that I have implemented
is hard-code the DNS IP address in each computer's TCP/IP properties.

I've left my computer set to obtain DNS server address automatically,
i.e. from the DHCP server. Every other day or so, my DNS server
address will continues to revert to the old IP address, and I have to
do an ipconfig release/renew to obtain the right DNS IP address. My
DHCP server IP address is correct, so I'm confused as to why it
sometimes sends out the wrong DNS IP address.

Any help would be greatly appreciated.

.

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