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This from the MIcro$oft Knowledgebase:
Typically, the Trickler program is installed automatically by the Gator OfferCompanion program; or, the Trickler program may be installed by Roger Wilco (voice-to-game integration software). The purpose of Trickler is to gather information about the Web sites that you visit. Trickler provides aggregate statistics to third-party vendors about users, traffic patterns, and related Web site information.
Trickler is also called Fsg-ag.exe (which is installed with AudioGalaxy) or other names that contain "fsg" or "trickler".