Uninstallation:AsDLLfilesarecreatedtosupportotherprogramsandsoftwaresworkingwell,thedataandfunctionsareactuallysharedbymanyprograms.whenyouuninstallaprogram,usercpl.dllmaybemistakenlydeleted.
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Uninstallation: As DLL files are created to support other programs and softwares working well, the data and functions are actually shared by many programs. when you uninstall a program, usercpl.dll may be mistakenly deleted.