Is there a way to 'backup' how a computer is prior to installing a program (AdAware in this case)? Last time went on a spyware installing binge, the computer got a blue screen. This computer has Windows XP, and apparently there is a feature to go to the last session(?) that worked. Thing is, when the computer got a blue screen, the last session option did not work. Is there something to do to initiate it?