Hi, You may have noticed that CCleaner was updated to version 2.36.1233 on 27 Sept 2010. See posting by ourstanley: https://www.wilderssecurity.com/showthread.php?t=283047 I quote a part of that update notice (emphasis by me): I was curious about what this CCleaner update was doing with MBAM. What I expected, it deletes the MBAM logs. Well, it does so only if you have put a checkmark in CCleaner - Applications - Utilities - Malwarebytes Anti Malware. BTW, on XP-home the logs are here: C:\Documents and Settings\(username)\Application Data\Malwarebytes\Malwarebytes' Anti-Malware\Logs\ Of course it is completely up to you if you want those logs to be removed. But it might be another situation when someone is trying to help you with an infection on a dedicated help forum (where they do Hijackthis and/or OTL analysis and often ask for a MBAM log). So a word of caution might be in place here.