Right Click Custom Scan Option Gone!

Im not tech savvy at all so this may be a very stupid question, but previously I could right click on a file and do a custom scan for that 1 file or even folder, now the option is gone completely (as the pic shows) how do i get my "Run Custom Scan with Norton" Command prompt back, thanks all in advance 

 

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[IMG]http://i5.photobucket.com/albums/y153/bigbadbenny/rightclick.jpg[/IMG]