Those who regularly download, read and save PDF files will, like me, have found considerable frustration when using Acrobat Reader.
At best, the Acrobat product is a large download, is slow to load and somewhat flaky in its rendering of files.
I've used Foxit Reader for a couple of years and found it very reliable.
Having been recently upgraded to Foxit Reader 2, it is better than ever and I recommend it highly.
Download Foxit Reader 2 here.