You must delete your "Preferences.cfg" file from
XP: C:/Documents and Settings/your user name/Application Data/Ableton/Live/Preferences
Note that on some Windows systems the application data folder is hidden by default. Here is what you have to do to make it visible:
1. Launch Explorer.
2. Select Tools/Folder Options/View.
3. Check "Show hidden files and folders."
you can see that deadtotheworld uses Macbook Pro with OSX...