Sumatra PDF is a slim,free,open-source PDF viewer for Windows.

Why another PDF reader?

Sumatra PDF is a PDF viewer for Windows. Sumatra has a minimalistic design. Simplicity has a higher priority than a lot of features. It’s small and starts up very fast. It’s designed for portable use:it’s just one file with no external dependencies so you can easily run it from external USB drive.
Keyboard shortcuts
* space –scroll by screen
* backspace –scroll back by screen
* k –scroll by one line
* j –scroll back by one line

* Down –scroll by one line
* Up –scroll back by one line
* n –goto next page
* p –goto previous page
* Page Down –go to next page
* Page Up –go to previous page
* g –goto page
* q –quit
* + –zoom in
* –- zoom out
* r –reload PDF document
* <Shift><Ctrl>+ –rotate clockwise
* <Shift><Ctrl>–- rotate counter-clockwise
* Home –go to first page
* End –go to last page
Command-line arguments
* -print-to-default FILE_NAME.PDF –prints a given PDF to a default printer
* -print-to PRINTER_NAME FILE_NAME.PDF –prints a given PDF to a printer named PRINTER_NAME
* -exit-on-print –when -print-to-default or -print-to is used,will exit after printing
Note:printing is experimental and not well tested.
Disable viewing PDF files directly in web browser (IE and FireFox)
Adobe Acrobat also comes with Internet Explorer and FireFox plugin which makes it take over PDF files downloaded via browser and display them directly in the browser. This is not always a desired behaviour and you can use Sumatra as the default PDF viewer in both IE and Firefox,without completely uninstalling Adobe Acrobat. Here are the steps (based on this blog post):
* Launch Sumatra PDF viewer
* Select File/Make Sumatra a default PDF reader
* Launch Adobe Acrobat
* Select Edit/Preferences
* Select Internet
* Uncheck Display PDF in browser
* Click OK