Anti-virus software like Norton Anti-virus can easily search your computer and delete keyloggers. If you want a quick way to remove keyloggers, I suggest this program.
http://anti-keylogger-elite.isecsoft-inc.qarchive.org
Its shareware, so you can just uninstall it whenever you like.
Oh, and since your so called *friend* tried to hack account, its obviously means that he cares more about virtual furniture than about you.