Boot Performance Monitoring Event 100 Errors

After some recent issues, I've been looking more carefully at the event logs. My system seems more healthy than it's been in months, but one thing I've noticed is that the Windows Diagnostics-Performance log has been showing "Error" or "Critical" for Event ID 100 as far back as I've got a retained log. The latest details are below. The log labelled this "Error." This boot was a "restart" and did not generate any log entry for events 101 to 110.

Could someone suggest why the system considers this an error and whether it's worth worrying about, and, if so, what to do about it. FWIW I've already cut back on the number of startup programs.

Many thanks, -Ron

Code:

   - System     

    - Provider     


[  Name]  Microsoft-Windows-Diagnostics-Performance    


[  Guid]  {CFC18EC0-96B1-4EBA-961B-622CAEE05B0A}
    

    
EventID 100    

    
Version 2    

    
Level 2    

    
Task 4002    

    
Opcode 34    

    
Keywords 0x8000000000010000    

    - TimeCreated     


[  SystemTime]  2013-03-09T21:15:26.927487000Z
    

    
EventRecordID 1799    

    - Correlation     


[  ActivityID]  {038B2A50-F800-0002-1026-19C40A1DCE01}
    

    - Execution     


[  ProcessID]  2284    


[  ThreadID]  1644
    

    
Channel Microsoft-Windows-Diagnostics-Performance/Operational    

    
Computer Ron-PC    

    - Security     


[  UserID]  S-1-5-19


  - EventData     

BootTsVersion 2    

BootStartTime 2013-03-09T21:12:11.718400400Z    

BootEndTime 2013-03-09T21:15:23.333281400Z    

SystemBootInstance 521    

UserBootInstance 489    

BootTime 168618    

MainPathBootTime 113318    

BootKernelInitTime 26    

BootDriverInitTime 6607    

BootDevicesInitTime 2981    

BootPrefetchInitTime 4733    

BootPrefetchBytes 90152960    

BootAutoChkTime 0    

BootSmssInitTime 23909    

BootCriticalServicesInitTime 1090    

BootUserProfileProcessingTime 2573    

BootMachineProfileProcessingTime 4025    

BootExplorerInitTime 65442    

BootNumStartupApps 8    

BootPostBootTime 55300    

BootIsRebootAfterInstall false    

BootRootCauseStepImprovementBits 0    

BootRootCauseGradualImprovementBits 0    

BootRootCauseStepDegradationBits 0    

BootRootCauseGradualDegradationBits 4194304    

BootIsDegradation false    

BootIsStepDegradation false    

BootIsGradualDegradation false    

BootImprovementDelta 0    

BootDegradationDelta 0    

BootIsRootCauseIdentified true    

OSLoaderDuration 2799    

BootPNPInitStartTimeMS 26    

BootPNPInitDuration 3090    

OtherKernelInitDuration 5549    

SystemPNPInitStartTimeMS 8468    

SystemPNPInitDuration 6498    

SessionInitStartTimeMS 15138    

Session0InitDuration 3678    

Session1InitDuration 461    

SessionInitOtherDuration 19768    

WinLogonStartTimeMS 39047    

OtherLogonInitActivityDuration 2230    

UserLogonWaitDuration 532

Thanks for the response. Yes, I've been monitoring those events. I have about a two year history, and for the whole period, while there have been a few boots below 100 sec, random sampling seems to scatter around 165. (Mostly reboots, since I tend to leave computer on all the time, rebooting after Windows Updates, etc.) These seem high to me, judging from others' reports, though I do realize many factors are involved. I was also curious why Windows considers these level 1 or 2 errors. Will continue to monitor while my machine settles down after recent upheaval and maybe eventually use Procmon for boot logging.

Thanks again for the interest and links, -Ron