I presume you want to Pull information from the Windows box and not have a Snare Agent push it to MARS.

The Snare agent is free from:

http://www.intersectalliance.com/projects/SnareWindows/

Depending upon how much reading you want to do outside of the Cisco Install and Setup guide, there are plenty of resources available:

1. From the Cisco Press, Security Threat Mitigation and Response (Understanding CS-MARS) by Dale Tesch

2. http://ciscomars.blogspot.com/

3. http://www.demolabs.co.uk/ This has some excellent online demos.

4. http://groups.google.com/group/cs-mars-ug?hl=en-GB

This is a User Group with some very good postings.

Hope this helps.