Sumatra PDF Portable
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Full user review
"If you just want to view and print PDFs painlessly get"
Small, FAST, and portable. What more do you want?
You have to manually (*pantpant*) reset your file association for PDFs
This will completely replace adobe acrobat in one year. Seriously, it's about ten times faster and simpler and smaller. I don't know how I've lived with acrobat for so long.