missing wsock32n.dll file

i am currently having problems with my internet explorer
after surfing for about 20 mins this page cannot be displayed and cannot find server appears even though my connection is still in tact. if i disconnect and reconnect the same thing happens, i have to restart my pc each time in order to start surfing again. after 20 mins or so the whole process starts again.
i suspected that the problem was due to the wsock32n.dll file
when i tried to locate it using the find files or folders programme
it was nowhere to be found. i also tried extracting the file using sfc however wichever restore file from location i chose the message the restore file from location does not exist appears.
why can't i find this file ? and how can i get it back

 

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