If removing them using the approach suggested in the other post doesn't work,
you may have a problem similar to what I just encountered...like you, every
single row in my spreadsheets had page breaks after them, and I couldn't
remove them. For me it turned out to be the printer I had selected to print
the file. If I changed printer selections (I have multiple printers to
choose from) it worked fine. So I deleted the offending printer from my list
and then reinstalled it using the CD that came along with it. That worked,
and they lived happily ever after.
Good luck.