You could try using this guide:
http://www.gameolosophy.com/Games/RP...ing-Guide.1825
It may take a bit of getting used to (I'd never used a program for capturing macros before trying the one mentioned here) but if you play with it a bit, you can build yourself a decent farming "bot" that is virus free. It's worth the extra effort to build one yourself instead of downloading one and risking having your account stolen, etc.
Also, just a small tip: I wouldn't try using any bot in an area that is inhabited by many bots already. Being in a guild with Arena Net staff, all you hear about are how "Oh, Elona is about to be cleaned out of a lot of Bots.. or.. Bergen Hot Springs is going to be hit with bot cleaning next". So.. I'd try to use the bot in some inconspicuous place first. Then if you feel brave, go somewhere where there are other bots. :x