FIRST PROBLEM

k, i just came from a jailbroken iPod 1.1.4 and just recently upgraded to 2.0 for free.So after my iPod finished restoring and updating,i check to see if all my apps work good.well they do except for the mail app which i got when jailbroken.the app cannot open,when i tap it,it loads for like 1 second then crashes.help me plzz
2nd Problem:Since my ipod was jailbroken,i used customize and downloaded a lock screen wallpaper.I just upgraded to 2.0 and it is still there.I try to choose other wallpapers in settings but the lock screen wallpaper is locked into it.Does anyone know what to do?how do i delete this?