If you have problems reading postscript files (*.ps) then download the file  gsv27550.exe (3.5Mb) from one of the following sources 

http://www.math.uwo.ca/~srankin/gs/gs.html    
http://www.isid.ac.in/~statmath/resources/miktex/miktex.html
http://math.bu.edu/people/mg/pscript.html