How can I tell if I have a keystroke trojan on my computer?

My ex seems to know all the places I visit online and someone mentioned he may have installed some sort of spyware on my computer. I never really let him use it without my supervision, but you never know...he was pretty computer proficient. I am always running Mcafee's latest spyware and Adaware on my computer to see if anything is on the computer that shouldn't be. However, is there a foolproof way I can tell I have some sort of keystroke stuff on here? I thought those spyware things were good enough.