HIDS solution for NT4 machines

I work in a large distributed network.  We have several workstations and 
servers that are running on NT4.  I've been tasked with finding some sort of a 
HIDS (Host based Intrusion Detection System) software solution to protect these 
machines from zero day exploits, worms, and BO's.  I've looked at Cisco, Blink 
by Eeye, Destop Protector by ISS, and Primary Response by Sana Security.  None 
of these will support anything lower than NT4 SP6a.  My biggest problem is I 
have several machines that are running below SP6a and because of the flaky 
software running on these machines, I can't install SP6a without breaking the 
app.  Does anyone have any good experience with other products for NT4 
server/workstation below SP6a.

Just a side note, most of these machines will be replaced within 2 years, but 
that is a long time to leave exposed machines on the network.

Thanks!

Bcihak

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