Should you run into an "Access Violation" or for any reason experience an error during system or session launch, you may need to trash your preference file. Like many applications Pro Tools keeps a record of your most recently used files, your settings, your preferences in a separate file. Occasionally this file gets corrupted and must be recreated. This file is called "Pro Tools 5_1 Preference.ptp." It resides in the directory \Documents and Settings\'username'\Applications\Digidesign of your boot disk (where 'username' is your Windows login username). Should you need to find this file and cannot, please consult Windows 2000 Help for instruction on how to Show Hidden Files. If you still cannot find the file, use Windows search for files or folders feature to find the file.