Apparently, Pest Patrol isn't very reliable. Some info here, or you can use the search (top right between faq & home) & look for "pest" or "pest patrol".
http://www.gnutellaforums.com/showth...ht=pest+patrol

Be careful with downloading. There are a lot of fake files around now, some containing malware. Here's some info on virus probs on the network:
http://www.gnutellaforums.com/showth...threadid=41432