Myles, symsilent.exe is pres-installed on new computers that come with a Norton trial and is used for activation.
I am guessing that your PC originally came bundled with a Norton trial which has since been uninstalled. It's perfectly safe to remove this program, see here for more details: http://www.shouldiremoveit.com/SymSilent-24480-program.aspx

July 11, 2014

Jim Hillier said
Myles, symsilent.exe is pres-installed on new computers that come with a Norton trial and is used for activation.
I am guessing that your PC originally came bundled with a Norton trial which has since been uninstalled. It's perfectly safe to remove this program, see here for more details: http://www.shouldiremoveit.com/SymSilent-24480-program.aspx
Thank you Jim.
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