By design, you cannot delete Level 100 - Administrator (All). If you've accidentally deleted any of the preprogrammed Permission Levels, you can simply create them again using the information below:
70 - Advanced Manager (All But Settings)
FlexCMS Core:
View Server and Version Information Blocks Management Pages Management Manage Users' Permission Levels Edit Another User's Profile Manage User Levels and Permissions Modify Site Display Preferences Edit/Create PHP Enabled Content Create New User Accounts View 'Where Are They Now' View Members List Modify Registration Form Fields Manage Modules Manage Smilies Switch Templates
View Server and Version Information Blocks Management Pages Management Manage Users' Permission Levels Edit Another User's Profile Manage User Levels and Permissions Modify Site Display Preferences Create New User Accounts View 'Where Are They Now' View Members List Modify Registration Form Fields Manage Modules Manage Smilies Switch Templates