Microsoft Security Essentials ("MSE") conflicts with other software, and CCleaner is named too.
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I almost feel a little responsible for that, since I originially wrote an entry that caused this and included it in winapp2.ini (and it was later included in the official)
It's not really a "problem," though. It's just the program thinking it hasn't been run in a while, and if you keep it running in the background like you're supposed to anyway, the logs aren't even deleted (mine never actuallys returns this error unless I manually stop the MSE services and run CCleaner.)