I am having issues with Vista taking 2+ minutes to boot up to logon.

Looking in the Diagnostics-Performance section in the Event Viewer, I have
many errors with Task Categories of System Performance Monitoring, Boot Perf
Monitoring and Shutdown Perf Monitoring.

Viewing the details tells me nothing about what is wrong or where to start
looking. I was hoping to see a service or program causing issues. Clicking
on event log online help returns "No results were found for your query.
Please see Search Help for suggestions."

Here is an example
The scenario and analysis results means nothing.
"Scenario : System Responsiveness" - "Analysis result : Analysis was
unable to find any root causes

Can anyone point me to resource where I can get a better understanding on
how to use the seemingly useless tools ?

Thanks

Log Name: Microsoft-Windows-Diagnostics-Performance/Operational
Source: Microsoft-Windows-Diagnostics-Performance
Date: 2/20/2009 6:45:28 PM
Event ID: 400
Task Category: System Performance Monitoring
Level: Error
Keywords: Event Log
User: LOCAL SERVICE
Computer: Andre
Description:
Information about the system performance monitoring event:
Scenario : System Responsiveness
Analysis result : Analysis was unable to find any rootcauses
Incident Time (UTC) : 2/21/2009 1:48:05 AM
Event Xml:
Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"
System
Provider Name="Microsoft-Windows-Diagnostics-Performance"
Guid="{cfc18ec0-96b1-4eba-961b-622caee05b0a}" /
EventID400/EventID
Version1/Version
Level2/Level
Task4005/Task
Opcode37/Opcode
Keywords0x8000000000010000/Keywords
TimeCreated SystemTime="2009-02-21T01:45:28.810Z" /
EventRecordID2925/EventRecordID
Correlation ActivityID="{00000000-EB7C-0001-B12A-6190C193C901}" /
Execution ProcessID="1636" ThreadID="2916" /
ChannelMicrosoft-Windows-Diagnostics-Performance/Operational/Channel
ComputerAndre/Computer
Security UserID="S-1-5-19" /
/System
EventData
Data Name="ShellScenarioStartTime"2009-02-21T01:48:05.071Z/Data
Data Name="ShellScenarioEndTime"2009-02-21T01:48:10.071Z/Data
Data Name="ShellSubScenario"1/Data
Data Name="ShellScenarioDuration"5000/Data
Data Name="ShellRootCauseBits"0/Data
Data Name="ShellAnalysisResult"1/Data
Data Name="ShellDegradationType"1/Data
Data Name="ShellTsVersion"1/Data
Data Name="ShellMachineUpTimeHours"0/Data
Data Name="ShellMachineSleepPattern"0/Data
/EventData
/Event