Hast du Divx installiert in einer adware supporteten Version?
Ansonsten auch mal hier schauen:
http://www.reger24.de/prozesse/Trickler.exe.php
Von der Gator-Homepage kann ich dir nur folgenden Eintrag bieten:
Q. Why isn't GAIN listed in the Add/Remove Programs window?
A. While you cannot uninstall GAIN AdServer software (i.e. the software that delivers GAIN Network ads) directly, you can uninstall any/all GAIN supported applications at any time by using the Add/Remove Programs list. Once you have uninstalled all GAIN supported applications, GAIN AdServer software is designed to stop delivering advertising, and self uninstall.
Quelle:
http://www.gainpublishing.com/help/gainfaq.html#8