I have a great problem on XP Pro Sp2.
Notice: Hardware P4 dual and nic realtek 8139 fully working. Tested with any
kind of Linux. No virus. No troyan. Tried sfc/scannnow and reinstallation
over current XP starting from CD.

I've tried everything, even started with UBCD4Win (avoiding the lock on
hardware profiles in the registry) and deleting every reg entry I can found
bounded to the nic, and every drivers present in the HD, inf, and even from
..cab archive cache.

I have disabled the nic, installed a new one, and I got the same problem
again.

I've serched hidden nic, but I don't see any other nic (

Tested various drivers, from the original bounded with the nic (and is for
XP) to new realtek update of this year.
NOTHING!

Everytime I reinstall the nic/driver, everything seems OK, but finally XP
says (sorry for traslation because my system is Italian located) that it
can find a file. I don't know what file because it says nothing about this
file. Every kind of driver i tested say that.

Do you have any procedure to check every single step XP do to reach that bad
result? A system to debug the problem step, by step finding why Xp end to
that result?