If the layouts are in a gallery somewhere you might consider getting this action (as much as I hate to send you to another store, this one is too good to pass up) WendyZine has an action that she says will take 72 dpi and make them 300 dpi.

For just $3.50 it's worth a shot, rather than beating yourself up. {{hug}} my laptop harddrive crashed a couple years ago, the feeling just can't be described. It was horrible to say the least.