Step 1. 

Download Ghostscript for Microsoft Windows 32 (bit) (as of 2011-07-04, the version number is 9.02, file name: gs902w32.exe, dated 2011-04-12) from sourceforge.net . Please note that, you must download this 32-bit file even if your Windows is 64 bit.

Install it.

Step 2.

For 32-bit XP, Vista and Windows 7

Download Redmon. As of 2011-05-04, the file to download is redmon17.zip. You can download it from (copy the address to your browser):

http://www.stat.tamu.edu/~henrik/GSWriter/redmon17.zip

or visit the following site to download:

http://pages.cs.wisc.edu/~ghost/redmon/index.htm

For 64-bit Windows 7

Download the 64-bit Redmon from

http://www.winimage.com/misc/redmon/

select the one that is suitable for your system. (eg. for English, it is redmon17x64.zip, for AMD64/Intel EM64T)
 

After download, unzip (must do this) the file and run setup.exe to install. For Windows 7 users, you must right-click the setup.exe file and then select "Run as administrator" command to run it.

Step 3. Restart PageFocus program. If you have Windows XP, it will complete the setup automatically. If you have Windows 7, it will instruct you to complete the installation with easy-to-follow steps. (Or you can select the PDF Setup command from the Help menu to complete the setup).