When I try to open a workbook pdf file on my store builder online, either a blank screen comes up, a download strip which goes nowhere, or a box which says there is a problem with your adobe acrobat/reader. If it is open, close it and try again. Well nothing is open that I know of. It use to work fine and now, nothing. I went to the control panel and went to add and remove files and tried the repair button. But the new download isn't doing anything either. Help!