I am running CCLeaner 1.15.507 Professional CCleaner and a window keeps popping up telling me that Update 1.O is available with buttons to update or cancel. Clicking on the update button appears to do nothing and then another window pops up in the background saying the update was successful. However, each time CCleaner is opened, the same update window pops up, see screen shot below. Is this a valid update for CCleaner or a virus of some sort?