I am having the same problem except that it's with Excel 2003. Somewhere
along the line my default setting for the 'print what' options in the print
dialogue has been changed from printing just the active worksheet to printing
the entire workbook which is causing me no end of grief.
Even when selecting 'active worksheet' and previewing, once the preview
window is closed the 'print what' setting has changed itself back to print
entire workbook, which is frequently causing hundreds of spurious pages to be
sent to my printer.  I cannot find any default setting options to change it
back. This is most frustrating.

To make matters worse I've got a feeling that as I send excel workbooks to
clients on a regular basis, some have reported experiencing the same problems
with their own workbooks that have had nothing to do with mine, but with the
problem manifesting itself only since I've uploaded or emailed workbooks to
their system that I've modified and saved on my own system suggesting that
the problem is spreading....

I'm having the same annoying problem, anyone have a fix?