Run this edit, then reset your preferred folder options:

Windows remembers 400 folder settings. When that number is reached some settings aren't retained any longer. You can change this to 8000 by adding this edit to the registry.

Increase Folder View Options Limit: (Line 2)
http://www.kellys-korner-xp.com/xp_tweaks.htm

To use the Regedit: Save the REG File to your hard disk. Double click it and answer yes to the import prompt. REG files can be viewed in Notepad by right clicking on the file and selecting Edit.