Upgrade to windows 10

Hi my name is Henrik, im from denmark. I recently upgraded  my Symantec Endpoint projektion to 12.15. Now im standing to have wWindows 10 on my computer :-). My problem is that im using an legal Symantec version , from my work, and each time i have to contact the software office to get the newer version , and they have to contact the computer Store Where is is bought. Its very  difficult to get the serial number each time, so i wonder if there may be a way to find the serial on my computer.

Best Regards

Henrik Tonnesen.  Sorry my english :-).