Do i have a key logger?

Okay so basically i don't know if i have a key logger because i went to youtube to see if i did have one under a file named "Svchost.exe". So i checked on my Task manger and it said i have 3 files Svchost.exe and the user name says SYSTEM they take off a lot of my CPU. and memeroy. and i have another one under a name of "Network system" so i know thats not bad. Can you please tell me if i have a key logger? If i do can you please help me on how to get rid of them thanks. (: I;m not that good with computer stuff btw :S