This is probably a sign of a corrupt menu file somewhere. If you have setup a custom menu, there could be a problem with on of the custom menu files.
Try going into the LabVIEW .ini file and deleting the line that reads �menuSetup="menuname"�. Then try starting LabVIEW again. If it starts OK, then you have a bad menu file. The only way to find which one is bad is to copy them one at time out of the directory at the path �LabVIEW x\menus\menuname�. First, go back into the LabVIEW.ini file and change the newly created line that should now read �menuSetup="default"� and change the �default� back to the name of your custom menu. Then just move each file one at a time out, then back into this directory trying to start LabVIEW each time. Eventually you�ll find
the bad one or ones. These can only be deleted and then rebuilt in LabVIEW.
If you are running one of the standard LabVIEW menus, the easiest way to fix it is to copy the menu files from another machine to this one.
Good Luck
Ed