hi kellie, welcome to the board
it sounds like you may have what are termed 'volatile' functions in your workbook - these are functions that have a volatile result that changes each time the workbook calculates. an example would be the =NOW() function, which returns the current date and time. since the time is constantly changing, so is the result of this formula. here are some other volatile functions:
RAND()
TODAY()
OFFSET()
CELL()
INDIRECT()
INFO()
even though you are not making any changes, a change in a formula like this will trigger excel to prompt you to save the change. see the excel help file or search this board for more information on, as well as a more complete list of, volatile functions.
post back if this doesn't answer your questions, or with any more details you can give about your workbook. if this is the source of your save as message, there are ways to avoid it
hth
kevin