After searching a bit, I found a solution within a thread on Photoshop 911. I removed all ".psp" files from the "Adobe Photoshop CS Settings" folder -- I just moved the files into a temporary folder. Photoshop recreate 3 files when I launched it:
- Adobe Photoshop CS Prefs.psp
C:\Documents and Settings\[username]\Application Data\Adobe\Photoshop\8.0\Adobe Photoshop CS SettingsWhere [username] is your login username.