unreadable pdf's when trying to fill in forms

when I open a pdf form and go to fill it in I end up with the above scrambled garbage. I tried uninstalling the pdf reader (Adobe Acrobat Reader DC) and re downloaded it but when I open the pdf I still have the same problem. This happens with any pdf that I open.
Can someone tell me how I can correct this problem. You should note that if I am on a website and open a pdf and fill in the blanks I have no problem with that it works fine it is only the pdf's that I download and save on my desktop.
I am running windows 10
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