Lightroom needs to configure your system for the ( ) plugin

Try starting LR in "admin" mode and see if that helps.

See the following (From Jeffrey Friedl blog) Jeffrey Friedl's Blog » FAQ for Jeffrey’s Plugins for Adobe Lightroom  . It works for me (I did it once as normal user, once "as administrator", doesn't know if necessary). Probably occurs after you decide to uninstall your previous LR version.

• Every time I start Lightroom, I get a message long the lines of “Lightroom needs to configure your system for the $$$/xxx=....... plug-in.”.
  This is an issue with Lightroom's installer; the plugin does not need to be reinstalled.

  To fix it, either uninstall/reinstall the Lightroom application, or open a command window and run

      "C:\Program Files\Adobe\Adobe Lightroom\lightroom.exe" -register 

  (Do include the quote symbols shown on the line above; also, you may need to adjust the drive name and folder path to match the location of your Lightroom install)

That did work for me.  Thanks

I'll also add that I ran the command prompt as an administrator.

you may have to use the cd command to get to the Adobe Lightroom folder.  Trying to run with the command quoted results in the message "C:\Program is not a valid command."

That command quoted above does work correctly; perhaps you left off the initial quote by accident:

Running the command in a cmd.exe window that had been "run as administrator" finally worked for me.  Thanks for the help!