You can use System Restore to go back to a date prior to the start of the problem. Click Start -> All Programs -> Accessories -> System Restore. Click the box that says show more restore points.
all of my icons on my Start Menu and on my desk top appear as "windows picture and fax viewer icon". And when I try to open a program, almost any program it opens up my "windows picture and fax viewer". I believe this all started when my wife was trying to download some photos from our camera one day on to the computer.. Can anyone help