This is a quick fix in case you have messed up Windows xp's "open folder" behavior and you have to manually right click and choose open option.

Just follow these steps:

• Open regedit
• Open the registry hive :"HKEY_CLASSES_ROOT\Folder\shell"
• Remove any extra keys that you may have added through the folder option->File type->advanced option menu, which may include the case in which you may have made a command as default open with command . For example in case you have made find command as default remove both the command key and entry.
• This reverts windows folder's to their default behavior of opening.

• Just do system restore to a previous date and it will automatically revert to its previous behavior.