ICMP Ping Sweep Detection

["David J. Jackson" <djackson () netdmz com>]

We are currently experiencing a daily issue with a worm that is spreading throughout our network and is running a ping 
sweep (to I assume look for more victims) and creating a Denial of Service on that segment.  If I run my sniffer 
(Ethereal) I can easily detect the packets that are being sent by filtering ICMP ping packets, and I usually find the 
infected computer and take corrective action.
 
Since I'm new to using Snort and IDS products alike, I'm wondering if there are tools available besides snort that will 
allow me to detect these ping sweeps and alert me when they happen so I can find out before users say they can't 
connect to anything.
 
I found many references to "scanlogd", but I can't seem to figure out how to get it up and running.  Also, please don't 
kill me, but I don't have a box with any Linux distribution on it right now that I would be able to use.  I only have 
Win2k and WinXP computers.  Are there any Win32 apps like this available?
 
Thanks to all in advance.
 
David Jackson