No puedo crear carpetas nuevas

[HKEY_CLASSES_ROOT\Directory]

Ésta está vacía. [...]

No debería estarlo. Copia y pega el siguiente texto en Bloc de notas, haz clic sobre Archivo, Guardar como, escribe "Directory.reg" (*con* comillas) y pulsa Aceptar. Accede a la carpeta donde hayas guardado el REG y combínalo en el Registro:

No copies esta línea

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\Directory]
@="Carpeta de archivos"
"AlwaysShowExt"=""
"EditFlags"=hex:d2,01,00,00
"InfoTip"="prop:DocComments"

[HKEY_CLASSES_ROOT\Directory\Background]

[HKEY_CLASSES_ROOT\Directory\Background\shellex]

[HKEY_CLASSES_ROOT\Directory\Background\shellex\ContextMenuHandlers]

[HKEY_CLASSES_ROOT\Directory\Background\shellex\ContextMenuHandlers\New]
@="{D969A300-E7FF-11d0-A93B-00A0C90F2719}"

[HKEY_CLASSES_ROOT\Directory\DefaultIcon]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\
00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,00,68,00,\
65,00,6c,00,6c,00,33,00,32,00,2e,00,64,00,6c,00,6c,00,2c,00,33,00,00,00

[HKEY_CLASSES_ROOT\Directory\shell]
@="none"

[HKEY_CLASSES_ROOT\Directory\shell\find]
"SuppressionPolicy"=dword:00000080

[HKEY_CLASSES_ROOT\Directory\shell\find\command]
@=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,00,25,\
00,5c,00,45,00,78,00,70,00,6c,00,6f,00,72,00,65,00,72,00,2e,00,65,00,78,00,\
65,00,00,00

[HKEY_CLASSES_ROOT\Directory\shell\find\ddeexec]
@="[FindFolder(\"%l\", %I)]"
"NoActivateHandler"=""

[HKEY_CLASSES_ROOT\Directory\shell\find\ddeexec\application]
@="Folders"

[HKEY_CLASSES_ROOT\Directory\shell\find\ddeexec\topic]
@="AppProperties"

[HKEY_CLASSES_ROOT\Directory\shellex]

[HKEY_CLASSES_ROOT\Directory\shellex\ContextMenuHandlers]

[HKEY_CLASSES_ROOT\Directory\shellex\ContextMenuHandlers\EncryptionMenu]
@="{A470F8CF-A1E8-4f65-8335-227475AA5C46}"

[HKEY_CLASSES_ROOT\Directory\shellex\ContextMenuHandlers\Offline Files]
@="{750fdf0e-2a26-11d1-a3ea-080036587f03}"

[HKEY_CLASSES_ROOT\Directory\shellex\ContextMenuHandlers\Sharing]
@="{f81e9010-6ea4-11ce-a7ff-00aa003ca9f6}"

[HKEY_CLASSES_ROOT\Directory\shellex\CopyHookHandlers]

[HKEY_CLASSES_ROOT\Directory\shellex\CopyHookHandlers\CDF]
@="{67EA19A0-CCEF-11d0-8024-00C04FD75D13}"

[HKEY_CLASSES_ROOT\Directory\shellex\CopyHookHandlers\FileSystem]
@="{217FC9C0-3AEA-1069-A2DB-08002B30309D}"

[HKEY_CLASSES_ROOT\Directory\shellex\CopyHookHandlers\MyDocuments]
@="{ECF03A33-103D-11d2-854D-006008059367}"

[HKEY_CLASSES_ROOT\Directory\shellex\CopyHookHandlers\Sharing]
@="{40dd6e20-7c17-11ce-a804-00aa003ca9f6}"

[HKEY_CLASSES_ROOT\Directory\shellex\PropertySheetHandlers]

[HKEY_CLASSES_ROOT\Directory\shellex\PropertySheetHandlers\Sharing]
@="{f81e9010-6ea4-11ce-a7ff-00aa003ca9f6}"

[HKEY_CLASSES_ROOT\Directory\shellex\PropertySheetHandlers\{1F2E5C40-9550-11CE-99D2-00AA006E086C}]

[HKEY_CLASSES_ROOT\Directory\shellex\PropertySheetHandlers\{5a61f7a0-cde1-11cf-9113-00aa00425c62}]

[HKEY_CLASSES_ROOT\Directory\shellex\PropertySheetHandlers\{ECCDF543-45CC-11CE-B9BF-0080C87CDBA6}]

[HKEY_CLASSES_ROOT\Directory\shellex\PropertySheetHandlers\{ef43ecfe-2ab9-4632-bf21-58909dd177f0}]
@=""

No copies esta línea

Solucionado.
Un *montón* de gracias Daniel.