Assuming that you've already installed Ruby and MySQL on your system
1) Download Darcs from www.darcs.net and decompress it in any directory
2*) Add the darcs root folder in the PATH environmental variable (i.e. C:\Darcs;)
3) Download the latest Nitro version from the repository through darcs by:
going to the directory you want to store nitro and
typing in command line: darcs get --partial http://repo.nitroproject.org nitro
4) Find the RUBYOPTS environmental variable (it should already contain -rubygems in it and after it add the following:
-I(NITRO)\nitro\lib -I(NITRO)\nitro\vendor -I(NITRO)\og\lib -I(NITRO)\glue\lib -I(NITRO)\raw\lib
5) Add the same directories in the PATH environmental variable as well
(ex. C:\nitro\nitro\lib;C:\nitro\nitro\vendor;C:\nitro\og\lib;C:\nitro\glue\lib;C:\nitro\raw\lib)
6) Go to the Nitro root directory and type: darcs pull and select "yes" to all patch prompts
7) Install the "facets" gem (gem install facets)
8) Install the "redcloth" gem (gem install redcloth)
9) Install the "xmlSimple" gem (gem install xml-simple)
10) Install the "mysql" gem (gem install mysql) [Select option 1]
11) Install the "uuidtools" gem (gem install uuidtools)
Properties. Select the Advanced Tab and on the bottom click on the Environmental Variables button.