Can't access one particular web site

[Jonathan Ryshpan]

The system on which I'm writing this can't access www.naxos.com .
Another system with the same network interface (A 2-Wire Home Portal
attached to a DSL line) has no trouble.  Typical results are from

        Firefox: www.naxos.com could not be found. Please check the name
        and try again.
        
        $ host www.naxos.com
        www.naxos.com has address 202.130.166.101
        Host www.naxos.com not found: 3(NXDOMAIN)
        Host www.naxos.com not found: 3(NXDOMAIN)
        
        $ ping www.naxos.com
        ping: unknown host www.naxos.com
        
However naxos.com, which has the same IP address, seems to work much
better:
        
        $ host naxos.com
        naxos.com has address 202.130.166.201
        naxos.com mail is handled by 10 email.naxos.com.
        naxos.com mail is handled by 20 postoffice.naxos.com.
        $ ping naxos.com
        PING naxos.com (202.130.166.201) 56(84) bytes of data.
        64 bytes from 202.130.166.201: icmp_seq=0 ttl=235 time=192 ms
        64 bytes from 202.130.166.201: icmp_seq=1 ttl=235 time=192 ms
        ...
        
        
I'm running FC4 with the latest upgrades on an AMD x86-64 system, all
latest upgrades installed.  My other system (which has no trouble) is
FC4, slightly out of date, on an i686 system.

What's going on?  Does my computer have a virus?

Thanks - jon