> Put this into your .emacs:
> 
>    (require 'server)
>    (server-start)

Slightly off topic but I occasionally have issues with emacsclient on windows.  It may be peculiar to my setup as I have a lot of customizations.  The problem is caused by the equivalent of the .emacs.d/server directory belonging to Administrators rather than my username and is fixed by deleting server directory and restarting emacs to restart server. 
I just mention this, so if it does occur you can avoid a lot of frustration.  

Munawar
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