Flush Photoshop CS4 preferences when freezing on startup

If Photoshop CS4 freezes on startup, or opens off-screen (into a multiple monitor ghost), you can flush the user preferences by renaming the preferences file:

C:\[User]\AppData\Roaming\Adobe\Adobe Photoshop CS4\Adobe Photoshop CS4 Settings\Adobe Photoshop CS4 Prefs.psp

Source:
http://www.wallpaperama.com/disp-post57.html