DNS SERVFAIL and NXDOMAIN on specific hostname

I have two DNS servers in my domain, Windows 2003 and Windows 2008, but recently both are failing to route users to www.cdw.com. I have had no other complaints with any other websites, but when trying to use cdw.com the page never loads. I tried to resolve the hostname and get the NXDOMAIN error below:

MyComputer:~ me$ nslookup cdw.com
;; Got SERVFAIL reply from 192.168.2.1, trying next server
Server:     192.168.2.2
Address:    192.168.2.2#53

** server can't find cdw.com: NXDOMAIN

MyComputer:~ me$ nslookup serverfault.com
Server:     192.168.2.2
Address:    192.168.2.2#53

Non-authoritative answer:
Name:   serverfault.com
Address: 198.252.206.16