I have an "almost" new 27 inch iMac; for the last 3 or 4 days now, every time I start the Mac up, I have a dialog box right in the center of the display, trying to get me to buy "Advanced Mac Cleaner"; When I use the red button and make "Advanced Mac Cleaner" go away, directly underneath it is the exact same thing, only this time it's for "Mac Ads Cleaner". (At least this one doesn't TALK to me!) Even though I really NEED to get all of my files "cleaned out", I'm guessing that Apple has an app that will do it just as well, (or possibly even better?) Now......(and this just started today) I have yet another dialog box below these two; this one doesn't even look like an ad; it looks like something that the computer is telling me..... At the top it says, "Mac File Opener"; below that it says; "there is no application set to open the document ".DS_Store" . (I have no clue what that even IS?) Search for an application that can open this document, or choose an existing application on your computer. (and below that are two buttons....) O Search the web using Mac File Opener O Search on App Store below that and to the right are two big "buttons", marked.... "Choose Application" "Search Now" The more I think about it, the more I think this one IS the computer talking to me? Anyone have any ideas?