I have Windows XP. When I plug my digital into my PC USB socket and turn the camera on, a window used to appear in XP, asking what default action it should take, with choices like Do nothing, Open a folder to same them, etc. There was also a tick box saying something like don't ask each time. I ticked or unticked this (whichever it is) so that the window doesn't appear everytime. I now want to change the default action. How do I get the window to reappear?