Okay so I helped my sister upgrade her Macbook Pro yesterday to Leopard simply because she wanted time machine--Apple's Backup Application just wasn't cutting it for her. Also her computer she said was feeling sluggish, so I felt that an archive and install would be the best--it's clean out the OS and any cobwebs in the process. During installation I picked the "Preserve Users & Network Settings" option, as the desciption seemed to mean that it would roll in her Mail, Applications, Documents, and so on, into the new OS. Well, it happened, but at the same time there's a folder sitting on her HDD titled Previous Systems, which I know is the archived OS. Well, I assumed that all of her stuff had been rolled into the new OS, but this was not true when I dragged it to the trash and then opened up the mail application to find nothing there. Is there any way to get rid of this folder safely?