i-Photo asked me if I wanted to update - I had been advided by a fellow Mac user that is was always a good idea to update so I did and as a result every photo taken in the past 3 weeks has vanished.

Also, I can do anything with any of the existing photos as all I get is the 'rainbow circle' egg timer thingy and have to force quit each time.

1: Have my photos gone for good?

2: How can I save the remainder onto CD and what is the max amount a CD can hold?

Many thanks.