@GirlyGirl
I've not used this, but a Google search came up with the following:
http://www.excelsupersite.com/how-to-unprotect-an-excel-spreadsheet-if-you-have-lost-your-password/
My own advice, if you create a password for an Excel file, you should either use a mnemonic password, or (for this AND for all your internet passwords) get something like 1Password https://1password.com/
