There are lot of free PDF readers available mainly Adobe Reader, Foxit Reader and Nitro Reader if you are looking for free PDF reader just to view PDF files only then you could go for All-in-One PDF Lite .
All-in-One PDF Lite is simple,light weight free PDF Reader compatible with Windows 2000/XP/Vista/7 .
All-in-One PDF Lite features
- Multi-page viewing
- Support for 1000s of fonts
- Page zoom and fit options
- Navigation toolbar
All-in-One PDF Lite is freeware.