Originally Posted by
svenakela
Go to the menu Tools->Options.. and then Rhino Options->Toolbars.
Do you have a madCAM menu specified there? You should have at least default and madCAM.
If not, right click under default and choose new. Select the file found under C:\Users\[your username]\AppData\Roaming\5XCNC\madCAM\5.0\UI\madCAM.rui and hit OK.
Please note that the folder AppData is hidden but if you specify it manually it will work.
If you don't have that file there was probably an issue with admin rights that caused the installation to fail.