Hi Rainbow_2
Right click on the Starft Button, select Open Windows Explorer > Left click on C to expand it > then Program Files (X86) - it is plain old Program Files in 32 bit Win 7 > then your Nort6no Product (NIS/ N 360) > then Norton data > then the engne number > then Defiinitions and finally irus Defs > The version will be the top number 200140515.008
or in other words, as some would write the location: (minus the X86 for 32 bit systems & I believe your Engine number may cary depending on when you installed Norton)
C:\Program Files (x86)\Norton Internet Security\NortonData\21.1.1.7\Definitions\VirusDefs