I have followed your instructions, but I do not have those files in my prefrences folder.
Here is a list of the files I do have;
AlesisFirewire.startup
/Audio/com.apple.audio.DeviceSettings.plist
Audio/com.apple.audio.SystemSettings.plist
com.apple.airport.opproam.plist
com.apple.alf.plist
com.apple.alf.plist.lockfile
com.apple.alf.plist~orig
com.apple.AppleFileServer.plist
com.apple.AppleFileServer.plist.lockfile
com.apple.applepushserviced.plist
com.apple.applepushserviced.plist.lockfile
com.apple.apsd.plist
com.apple.BezelServices.plist
com.apple.BezelServices.plist.lockfile
com.apple.Bluetooth.plist
com.apple.Bluetooth.plist.lockfile
com.apple.ByteRangeLocking.plist
com.apple.captive.plist
com.apple.CoreRAIDServer.cfdb
com.apple.dockfixup.plist
com.apple.driver.AppleIRController.plist
com.apple.driver.AppleIRController.plist.lockfile
com.apple.HIToolbox.plist
com.apple.HIToolbox.plist.lockfile
com.apple.iokit.AmbientLightSensor.plist
com.apple.keyboardtype.plist
com.apple.keyboardtype.plist.lockfile
com.apple.loginitems.plist
com.apple.loginitems.plist.lockfile
com.apple.loginwindow.plist
com.apple.loginwindow.plist.lockfile
com.apple.MCX.plist
com.apple.noticeboard.plist
com.apple.noticeboard.plist.lockfile
com.apple.P2PSupervisor.plist
com.apple.pcast_integration.plist
com.apple.print.makequeues.plist
com.apple.print.makequeues.plist.lockfile
com.apple.security.appsandbox.plist
com.apple.security.plist
com.apple.security.systemidentities.plist
com.apple.SetupAssistant.plist
com.apple.SetupAssistant.plist.lockfile
com.apple.SoftwareUpdate.plist
com.apple.SoftwareUpdate.plist.lockfile
com.apple.storeagent.plist
com.apple.storeagent.plist.lockfile
com.apple.TimeMachine.plist
com.apple.TimeMachine.plist.lockfile
com.apple.updatesetings.plist
com.apple.windowserver.plist
com.apple.xsanmgrd.plist
com.microsoft.PlayReady.plist
com.native-instruments.Content.plist
com.native-instruments.Content.plist.lockfile
com.native-instruments.Kontakt%205.plist.lockfile
com.native-instruments.Massive.plist
com.native-instruments.Massive.plist.lockfile
com.native-instruments.ServiceCenter.plist
com.native-instruments.ServiceCenter.plist.lockfile
com.native-instruments.Supercharger.plist
com.native-instruments.Supercharger.plist.lockfile
com.native-instruments.The%20Giant.plist
com.native-instruments.The%20Giant.plist.lockfile
DirectoryService/
loginwindow.plist
loginwindow.plist.lockfile
OpenDirectory/Configurations/
OpenDirectory/Configurations/Contacts.plist
OpenDirectory/Configurations/Search.plist
OpenDirectory/DynamicData/
OpenDirectory/opendirectoryd.plist
org.cups.printers.plist
SystemConfiguration/CaptiveNetworkSupport/
SystemConfiguration/CaptiveNetworkSupport/Settings.plist
SystemConfiguration/com.apple.airport.preferences.plist
SystemConfiguration/com.apple.Boot.plist
SystemConfiguration/com.apple.network.eapolclient.configuration.plist
SystemConfiguration/com.apple.PowerManagement.plist
SystemConfiguration/com.apple.smb.server.plist
SystemConfiguration/com.apple.smb.server.plist.lockfile
SystemConfiguration/com.apple.wifi.message-tracer.plist
SystemConfiguration/NetworkInterfaces.plist
SystemConfiguration/preferences.plist