Question : Destination Host Unreachable for all internet addresses.

One Windows Vista computer on my network sometimes (not always) has a problem reaching any internet sites.  It usually resolves itself after restarting the computer, but it would be nice to find the cause and fix it.
When I ping any domain name or IP outside our network, I just get "Reply from 192.168.5.55: Destination host unreachable." (reply from the computer I'm pinging from)
If I ping internet sites from any other computer, it works fine.  Nslookup and ping will still resolve to the correct IP addresses.  No firewall is on this computer.  And I can access the network files and company intranet just fine.  Any ideas of where to look?  Is it likely to be a bad network card or something?  If that were the case, I don't understand why I could access the company intranet.  Routing table below...
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===========================================================================
Interface List
  8 ...00 1e 4f c9 1f c1 ...... Intel(R) 82566DM-2 Gigabit Network Connection
  1 ........................... Software Loopback Interface 1
 12 ...00 00 00 00 00 00 00 e0  isatap.****.int
  9 ...02 00 54 55 4e 01 ...... Teredo Tunneling Pseudo-Interface
===========================================================================
 
IPv4 Route Table
===========================================================================
Active Routes:
Network Destination        Netmask          Gateway       Interface  Metric
          0.0.0.0          0.0.0.0         On-link     192.168.5.55     20
          0.0.0.0          0.0.0.0     192.168.5.1    192.168.5.55     20
        127.0.0.0        255.0.0.0         On-link         127.0.0.1    306
        127.0.0.1  255.255.255.255         On-link         127.0.0.1    306
  127.255.255.255  255.255.255.255         On-link         127.0.0.1    306
      169.254.0.0      255.255.0.0         On-link     192.168.5.55     30
  169.254.255.255  255.255.255.255         On-link     192.168.5.55    276
     192.168.5.0    255.255.255.0         On-link     192.168.5.55    276
    192.168.5.55  255.255.255.255         On-link     192.168.5.55    276
   192.168.5.255  255.255.255.255         On-link     192.168.5.55    276
        224.0.0.0        240.0.0.0         On-link         127.0.0.1    306
        224.0.0.0        240.0.0.0         On-link     192.168.5.55    276
  255.255.255.255  255.255.255.255         On-link         127.0.0.1    306
  255.255.255.255  255.255.255.255         On-link     192.168.5.55    276
===========================================================================
Persistent Routes:
  None
 
IPv6 Route Table
===========================================================================
Active Routes:
 If Metric Network Destination      Gateway
  1    306 ::1/128                  On-link
  8    276 fe80::/64                On-link
  8    276 fe80::8d64:1495:fd11:47d6/128
                                    On-link
  1    306 ff00::/8                 On-link
  8    276 ff00::/8                 On-link
===========================================================================
Persistent Routes:
  None
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Answer : Destination Host Unreachable for all internet addresses.

Well, I replaced the network cable, moved it to a different port on the switch and messed with the drivers and haven't seen the issue again recently.  I don't know if it's solved or not, but I'm done with it unless I get it again.  Maybe it was the port or the cable.
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