If you run the following command line from the public folder and get the following error:

`const_missing': uninitialized constant RailsFCGIHandler (NameError)

Then one of the possible error may be that the RubyForIIS installer has placed some files in the wrong folder. Look for a subdirectory called 'RubyForIIS' somewhere in the c:\ruby folder. you will need to copy all contents to the C:\ruby\lib\ruby\site_ruby\1.8 folder.