Acroread 5.010-4.1 Broken

After doing a YOU update, tried Acroread but it still does not work. I had this same problem earlier, posting 10 Jan., "Adobe pdf viewer". Opening a pdf file defaults to +260 magnification and about 1/4 of the page is lost on the right hand margin. There is no vertical or horizontal scroll bar. My previous fix for this was to revert to Acroread 5.09-6 which worked fine. I have again installed Acroread 5.09-6 and it works. Janis