This suggestion involves editing of the registry. Improper editing of the registry can cause your computer to become unbootable. ALWAYS
backup your registry before modifying the registry.
To backup your registry, create a System Restore point. Alternatively, you can use the free utility ERUNT to create backups of your registry: http://www.larshederer.homepage.t-online.de/erunt/
For more information about modifying the registry, see this Microsoft article: http://support.microsoft.com/default.aspx/kb/256986
file to your desktop.
Double click on it, and allow registry merge.