Custom headers and footers are a property of the workbook and not a global
property.
I would suggest you record a macro while doing your setup then store that
macro in your Personal.xls. See below for Chip Pearson's header/footer
macros.
Alternative.......
Open a new workbook. Customize as you wish. File>Save As Type: scroll down
to Excel Template(*.XLT) and select. Name your workbook "BOOK"(no quotes).
Excel will add the .XLT to save as BOOK.XLT.
Store this workbook in the XLSTART folder usually located at........
C:\Documents and Settings\username\Application Data\Microsoft\Excel\XLSTART
This will be the default workbook for File>New>Workbook.
Existing workbooks are not affected by these settings. Footers for them will
have to be done manually or via macro(see Chip Pearson reference below)
You can also open a new workbook and delete all but one sheet. Customize as
you wish then save this as SHEET.XLT in XLSTART folder also. It now becomes
the default Insert>Sheet.
More can be found on this in Help under "templates"(no quotes).
If you want a macro to set headers/footers see Chip Pearson's site for code.
http://www.cpearson.com/excel/headfoot.htm
Gord Dibben Excel MVP