track worm virus on NT/W2K machines

[Mohd Adam Baharun <adamxx7 () streamyx com>]

Hi ALL,

I would like some suggestion on what software to use / be good if its free, 
so that I can install on one of my NT or W2K servers to track down worms 
like the current WELCHIA, BLASTER and DUMARU. My organization networks are 
currently badly hit by these worms. Please help.