Merry Clean Virus Keylogger Adware - Version 1.3.70 Merry Clean Virus Keylogger Adware is a malicious computer software (malware) removal application. Samples of malware include various types of adware (displays unwanted advertising); spyware (may keep and send logs of your keyboard and mouse activity, such as credit card or personal identity information); hidden dialers (may initiate unsolicited phone call which then shows on your bill), and more.