How to: Unprotect structure or windows of a workbook.
Solution:
Select 'Protection' from the 'Tools' menu and select 'Unprotect Workbook...' from the submenu.
1) Select the 'Tools' menu and select 'Protection'. (A submenu appears.)
2) Select 'Unprotect Workbook...' from the submenu.
3) If a password was assigned:
a) Type the password in the 'Unprotect Workbook' dialog box.
b) Click 'OK'.