Angelina Jolie

is there a way to tell if there is a key logger program on my computer?

when I go into my email account (aol) and try to read one it loads really slow and just now when I signed into yahoo my pass word came up without me typing it in and i don’t have it set for that. so can it be that there is some sort of spyware or key logging program on my computer and if so how can I tell or find the program.
I’m using windows vista