When I try to restart Jenkins after an upgrade/update of plugins etc I get the following message in the error log:

jun 11, 2014 7:43:12 FM hudson.model.UpdateCenter$UpdateCenterConfiguration download
INFO: Downloading CVS Plugin
jun 11, 2014 7:43:13 FM hudson.model.UpdateCenter doSafeRestart
INFO: Scheduling Jenkins reboot
jun 11, 2014 7:43:13 FM jenkins.model.Jenkins$24 run
INFO: Restart in 10 seconds
jun 11, 2014 7:43:23 FM jenkins.model.Jenkins$24 run
SEVERE: Restarting VM as requested by anonymous
jun 11, 2014 7:43:24 FM jenkins.model.Jenkins$24 run
WARNING: Failed to restart Jenkins
java.io.IOException: Restarting a service
[Jenkins] $ C:\Program\Jenkins\jenkins.exe restart!
System.UnauthorizedAccessException: ?tkomst nekad. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))
at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
at System.Management.ManagementScope.InitializeGuts(Object o)
at System.Management.ManagementScope.Initialize()
at System.Management.ManagementScope.Connect()
at WMI.WmiRoot..ctor(String machineName)
at WMI.WmiRoot..ctor()
at winsw.WrapperService.Run(String[] _args)
at winsw.WrapperService.Main(String[] args)

at hudson.lifecycle.WindowsServiceLifecycle.restart(WindowsServiceLifecycle.java:139)
at jenkins.model.Jenkins$24.run(Jenkins.java:3342)

I use Jenkins 1.567 (Windows XP).