The default settings for action to be taken when an infection is found is set to ‘ask’. So each time an infection is detected, you will be prompted at the screen to take the necessary action. The question here is not sure. But if you had previously answered their question to delete/repair/move to chest, it, it is asking again just to make sure because the file is in windows folder (ignored the .old). In any case, you might have pressed a key. Otherwise, there are other options that comes up during a boot time infection detection.