I am having a problem with one pc in my office. Files created in excel seem to lose information and or formulas on its own. Sometimes it completely locks up everytime she enters one page on a particular spreadsheet, the other pages in the workbook work great. We have recreated the files, reloaded office 2003, changed hard drives(increased size) and are now on a brand new pc running xp pro and office pro. the same problems are starting all over. The operator fears its something wrong with her. I have checked for macro virus's and everything. If its operator error I can't figure out what it is. Im hoping someone has some suggestions of what i might can do or where to start also how do you check for hidden cells or rows in the spreadsheet?