Windows XP/2003/Vista/2008/7

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Network\Connections\StatMon]
"ShowLanErrors"=dword:00000001

This networking tweak will show any errors your network may have, such as bad packets.
By having this enabled this will show you when your networking is failing due to a bad router or network card.

Ideally your errors should stay 0 if you ever have any errors its time to start finding out why!

-Shane