Client computers change DNS

Hi all:
Last week changed my DC. Got a new machine running as DC, DHCP server
and DNS server.
Users can connect with no problem and get the right DNS servers I am
assigning them through DHCP.
Problem is suddenly (have detected no trigger for that) they change DNS
servers. Instead of .xxx and .yyy they've got .zzz, wich was the old
dns server.
Most strange of all, DHCP server is still the same in their computer.
Btw, both DHCP and DNS services have been uninstalled from old server.
Anyone can provide an idea about this?
Thanks in advance.

.

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