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I like and use coolPDFreader because it is free, small (904 kb or less depending on the type of installer), uses very little resources, and is very fast.
http://www.pdf2exe.com/reader.html8 reasons to choose coolPDFreader :
View and Print PDF
Convert PDF to BMP, JPG, GIF, PNG, WMF, EMF, EPS
Extract PDF to TXT
Support PDF files of all versions
Work with 68+ different languages
Zoom in/out and Rotate page displays
Slide show PDF document with full screen
Small in size, only 650KB (installed program)
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