As pointed out, it is very possible that your dir.mnu file was accidently over written in your \instr.lib directory. This can happen when unzipping an instrument driver without the create directories option enabled in your unzip utility or if the zip file was created without storing folder information. One quick fix, without re-installing LabVIEW or repairing LabVIEW, is to copy the user.lib's dir.mnu file to the instr.lib directory. The menu palettes behave the same, they just have a different icon. Alternatively you can copy the attached dir.mnu file to your \instr.lib directory.