Bit defender Anti Crypto wall

  conrail 10:59 28 Jan 15

on the last couple of days when I switch on my win 8.1 laptop I get a back box in the center of the display with Bitdefender Anti Cryptowall telling me there is a new version available to download, I do not have this program installed, I have run ccleaner, clean master, IObit Uninstaller and windows programs and features, this program does not show up in any of them, have run Malabytes anti malaware program but it did not find anything, how can I remove this annoying pop up, all help and advice apreciated

  conrail 10:09 29 Jan 15

thanks Jock1e, one or more of your suggestions appear to have worked, box has not appeared since, usually 1st thing that appears when I switch on, I appreciate your help and advice, again many thanks

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