iTunes8: Activate half-star ratings for windows

Required:
iTunes 8. Make sure it doesn't run, or you'll have to restart it.

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Edit: easier solution!
Press Win+R to open the Command box.
Type cmd and press enter to open a command line.
Copy the following text:

"%CommonProgramFiles%\Apple\Mobile Device Support\bin\defaults" write com.apple.iTunes allow-half-stars -bool TRUE

...and press enter.
Attention: Pasting in the command line works only via right click!


If this doesn't work for you, maybe the following one is right for you.
My old & crafty solution:

Required:
Notepad ++. Standard Notepad gets confused with XML files.

• Press Win+R to open a Command box.
• Type "%appdata%" and press enter. This will bring you to the hidden application settings folder.

• Open the folder "Apple Computer" and, within, the "iTunes" Folder.
  You should see a file named iTunesPrefs, probably with a .xml following (according to your view settings). Do not mistake it for the iTunes.pref, this is a version from earlier iTunes and not editable as easily.
  

• Start Notepad ++.
• Drag the iTunesPrefs in this window to open it for editing.
  
  
• Do not panic. Information is encrypted for iTunes to be readable, you don't have to understand anything.
• Scroll all the way and search the sequence of:
  

  
  </dict>
  </dict>
  </plist>

• insert a new line above and copy/paste:
  

<key>allow-half-stars</key>
<data>
dHJ1ZQ==
</data>

• Save and close - that's it.

Restarting iTunes should leave you with a much finer star control.