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Most people thing of keyloggers as malicious software, but don't forget about hardware keyloggers that can be plugged into a USB port. Obviously these are easy to detect on a laptop, but on a desktop they could potentially go unnoticed for months.
Beyond checking to make sure nothing unwanted is plugged in, you can choose from a number of free software options that detect keyloggers. Two of the better free choices, although pay versions are available for both are Zemana and SpyShelter. I would probably go with Zemana, but both are fine. I don't think SpyShelter will work with 64-bit systems, so depending on your machine, that could make the decision for you.