So when ever i try to use the amazing rigify addon that comes with blender and i push generate to generate the rig, lots of the bones are there but it does not make the finger bones, elbow, knee etc. what do i do? i know how to rig from scratch but that will take long. any idea hot to fix this issue?
Instead of pushing the generate button to make the rig, try going Shift+A->Armature->Human(Meta-rig), and this should give you a complete rig.
I have problems with the generate button as well; the script crashes when I try to use it, but the Shift+A->etc method works well for me.
Hope this helps.
Plan A: Make sure all the bones are named right and none are missing.
Plan B: try running a older version of blender.
Plan C: Make a rig from scratch 
as it turns out there is a problem with the addon. whenever you generate the rig the hands are in the arm pits until you press reload trusted