But, IS it a trojan and NOT a false positive ?
STRONGLY suggest you scan tcpip.sys here to determine what the situation is:
http://www.kaspersky.com/scanforvirus

If Norman quarantines or deletes the file than Windows will keep
informing you that the files is *required* and that you should 'repair'.

MowGreen [MVP 2003-2008]
===============
*-343-* FDNY
Never Forgotten
===============


RRC wrote:

> I get this message from Norman "Location: c:\windows\system32\drivers\tcpip.sys
> Trojan: W32/Hupigon.AIVC"
>
> It is the same trojan every time and then windows asks to repair windows
> again by installing it.
>
> Just before I installed all the updates I did a spyware scan and removed all
> bugs. Then I installed all the updates and reboot my pc. And then the trojan
> attacks.
>