Dear K.B. Vijaya Kumar,
in case you create the AddOns dirctory makd sure
it is AddOns and not Addons.
Furthermore
FileNames["FeynCalc.m",$Path,2]
should return something (and not an empty list).
So you might want to add the installation directory
to $Path, but it should not be necessary if you
installed it to:
ToFileName[{$TopDirectory, "AddOns", "Applications", "HighEnergyPhysics"}]
Maybe the problem is also the empty space between
"program files".
Try to put Mathematica into a different location without
spaces (you may have to deinstall and reinstall, I don't
know).
If this still does not work send me email to
rolf AT mertig.com.
Regards,
Rolf
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