3 tools required,

Activeperl   (http://www.activestate.com/activeperl/)
Mercurial    (http://mercurial.selenic.com)
PSPad        (prefered text editor, http://www.pspad.com)

1) Install Mercurial, all defaults during install active
2) Install pspad

2) Open the command prompt,
2a) cd %USERPROFILE%
2b) hg clone https://fanboy-adblock-list.googlecode.com/hg/ fanboy-adblock-list
2c) cd fanboy-adblock-list
2d) cd .hg

3) open fanboy-adblock-list/.hg/hgrc in pspad
add the following to the file,
[auth]
example.prefix = https://fanboy-adblock-list.googlecode.com/hg/
example.username = Your Name <yourgoogleaccount@gmail.com>
example.password = googlecodepassword

(Note, use of example.* text is fine, use the googlecode password not the gmail password)