If you want a good (used it myself) scanner that wont even show up on the proccess list you have Invisilog- http://www.webattack.com/get/invisilog.html (but it's not freeware).

A free/good one is Perfect Keylog http://www.webattack.com/get/perfectkl.html, but i don't know if it will show in the proccess list or not.

knock urself out