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If you think your computer has been infected with a keylogger, there are some steps you can take to detect and remove it. First, install software that will detect malware such as keyloggers and viruses. Run a thorough scan. Depending on the software used, follow the steps to remove the keylogger.
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.