From: "Hrvoje Mesing" 

Hi,

also, nice things to try are purging the arp cache and ipconfig /flushdns.

Then again, You can reinstall TCP/IP protocol. Go to Network Connection
(with which You have problems and in which You wish to reinstall TCP/IP),
then under General properties TAB click on Install... button (like You
would add IPX or any other), then click on the Protocol. Now, as You see,
You cannot uninstall TCP/IP as it is core one for WinXP+, but! You can
reinstall it, so under ..>install>Protocol> goto Have Disk... and
browse to C:\windows\inf\ and load sysoc.inf then select TCP/IP protocol
and install it again.
This will do a trick And Is working.

CrossingFingers.


-+-
M.

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