@kiterunner, the key logger doesn't have to be on your computer. It could be installed the network server. It logs all the keystrokes from all the computers in the network. Be informed that it may also be logging all your activities including which websites you visit and how log you stay on a particular website.
However, keyloggers have limitations. To cheat them, you can:
1. Enter your passwords in a mixed up manner.. eg if you password is kiterunner2012
type
run first, next take the mouse and go to the beginning [click]run and type
kit. Now you have
kitrun. Go to the end and type
12. You will have
kitrun12.... Continue till your password is complete. Most keyloggers don't capture mouse movements or cursor movements or delete. Try your luck.
2. Download keyboard scramblers. Try this
Keyboard scrambler it will encrypt your keystrokes.
3. Install a good antivirus software.
My two cents.