Open each folder in the same window option is disabled... How to Enable?

This can be caused by a virus ( W32 ), Malware, or an error in your registry

You can also try the following:Open notepad, and type the following text

(Please make sure the spelling is correct ):

WindowsRegistryEditorVersion5.00
[HKEY_CLASSES_ROOT\Folder\shell]
[HKEY_CLASSES_ROOT\Folder\shell\explore]"BrowserFlags"=dword:00000022"ExplorerFlags"=dword:00000021
[HKEY_CLASSES_ROOT\Folder\shell\explore\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,\ 65,00,20,00,2f,00,65,00,2c,00,2f,00,69,00,64,00,6c,00,69,00,73,00,74,00,2c,\ 00,25,00,49,00,2c,00,25,00,4c,00,00,00
[HKEY_CLASSES_ROOT\Folder\shell\explore\ddeexec]@="[ExploreFolder(\"%l\", %I, %S)]""NoActivateHandler"=""
[HKEY_CLASSES_ROOT\Folder\shell\explore\ddeexec\application]@="Folders"
[HKEY_CLASSES_ROOT\Folder\shell\explore\ddeexec\ifexec]@="[]"
[HKEY_CLASSES_ROOT\Folder\shell\explore\ddeexec\topic]@="AppProperties"
[HKEY_CLASSES_ROOT\Folder\shell\open]"BrowserFlags"=dword:00000010"ExplorerFlags"=dword:00000012
[HKEY_CLASSES_ROOT\Folder\shell\open\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,\ 65,00,20,00,2f,00,69,00,64,00,6c,00,69,00,73,00,74,00,2c,00,25,00,49,00,2c,\ 00,25,00,4c,00,00,00
[HKEY_CLASSES_ROOT\Folder\shell\open\ddeexec]@="[ViewFolder(\"%l\", %I, %S)]""NoActivateHandler"=""
[HKEY_CLASSES_ROOT\Folder\shell\open\ddeexec\application]@="Folders"
[HKEY_CLASSES_ROOT\Folder\shell\open\ddeexec\ifexec]@="[]"
[HKEY_CLASSES_ROOT\Folder\shell\open\ddeexec\topic]@="AppProperties"
[-HKEY_CLASSES_ROOT\Directory\shell\explore]
[-HKEY_CLASSES_ROOT\Directory\shell\open]
[-HKEY_CLASSES_ROOT\Drive\shell\open]
[HKEY_CLASSES_ROOT\Drive\shell]@="none"
[HKEY_CLASSES_ROOT\Directory\shell]@="none"
[HKEY_CLASSES_ROOT\Folder\shell]@=-

Save the file "samefolderwindow.reg", and close notepad. Right click on the file and click merge. The information should be modified / added in your registry.