If you working as Localhost and want to set permalinks then be sure to activate the rewrite_module in the "httpd.conf" file that locate in "C:\wamp\bin\apache\Apache2.4.4\conf" or "C:\wamp\bin\apache\Apache2.4.4\conf\original"
find the line "#LoadModule rewrite_module modules/mod_rewrite.so" and remove the "#" its mean enabling the functionality and save the file and restart your server then you enable permalink it would work