Group Policy Client – GPSVC.DLL
Gpsvc.dll is the Microsoft Group Policy Client. Group Policy is an infrastructure used to deliver and apply one or more desired configurations or policy settings to a set of targeted users and computers within an Active Directory environment. This infrastructure consists of a Group Policy engine and multiple client-side extensions responsible for writing specific policy settings on target client computers.
If your computer is in a workplace setting, don't remove this file without checking with your IT Professional. You'll find more information and a handy FAQ at http://technet2.microsoft.com/windowsserver/en/technologies/featured/gp/faq.mspx.
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Microsoft