Open the registry editor by going to Start » Run » type "regedit".
Once the Registry Editor is open, go to the File Menu and choose "Export". While in the export menu, select "All" at the bottom of the menu to backup the entire registry. Save the file to a location of your choice.
Go to HKEY_CURRENT_USER » Software » National Instruments.
From the tool bar, select Edit » Permissions.
Once in the Permissions menu, select Administrator and check the Allow Full Control Box.
Then click on the Advanced button, and select "Replace Permission Entries for all Child Objects".
Save the settings.
Repeat steps 4-7 for HKEY_LOCAL_MACHINE » Software » National Instruments.