As you probably know, the Network Connection Status window shows the number of packets received and sent via the adapter. However, you can perform a registry hack to show the amount of errors as well, which can help alert you of network problems. To do this, add the following key and value:
Hive: HKEY_LOCAL_MACHINE
Key: SYSTEM\CurrentControlSet\Control\Network\Connections\StatMon
Value Name: ShowLanErrors
DWORD Value: 0 = default, 1 = enable error count
