Distorted pdf's from all sources.

Hi,

I am using Adobe Acrobat to view PDF's I have created in Word and incoming from suppliers etc.  Every time I click on the PDF it becomes totally distorted and unreadable.  Once I start scrolling, the image corrects itself.  Only until I try and click on it again and the same thing happens.  The program is un-usable for me at this stage unless I only wish to view the file.  The supplied screenshot is a suppliers transaction report.  This happens on any PDF from any source including created by me.