Usually I smell "wood burning" J/K

http://www.google.com/search?q=detec...utf-8&oe=utf-8

There are hardware and software keyloggers.

Do you have some reason to suspect as keylogger?

Compromised passwords etc?

Anyway, check your keyboard and its connecting cable or wireless connections for anything strange. Then check with software to detect a rootkit or keylogger. Rootkits are installed at kernel level usually and they are difficult to detect. Online or virus scanners won't detect them if they are real rootkits at kernel level.

A reformat is a sure way to get rid of a kernel level rootkit or software keyloger.