I had the same problem. This fixed it:
Dear Customer,
Thanks for your reply.
I am glad to hear the SP1 update was installed successfully. However, the event log service failed to start. At this time, I would like to ask if the UAC is disabled on your computer. If so, please re-enable it and check if the issue persist.
This behavior may occur if one of the following factors is true:
1. We do not have permission for the C:\windows\system32\logfiles\wmi\rtbackup folder.
2. The Windows Management Instrumentation (WMI) service has been corrupted.
To troubleshoot this issue, I suggest we first perform these steps:
Take ownership of the rtbackup folder
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1. In the "Start" menu, locate "Command Prompt". Right-click and choose "Run as Administrator". If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
2. Type the following commands, then press "Enter" to execute them one by one. Please note the space before the command and its parameter.
takeown /f C:\windows\system32\logfiles\wmi\rtbackup
cacls C:\windows\system32\logfiles\wmi\rtbackup /G administrators:F
3. Restart the computer to check the issue.
What is the result? If it does not work, let us repair the WMI service.
Reset Repository folder
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1. Click Start button, type “cmd” (without the quote) in the search box.
2. On the program results list, right click the “cmd.exe” and choose “run as administrator”.
3. In the command window, type the following commands and press Enter, one by one.
NET STOP WINMGMT
CD /D %WINDIR%\SYSTEM32\WBEM
REN REPOSITORY REPOSITORY.OLD
NET START WINMGMT
4. Restart the computer and access Windows Security Center to check whether our issue still appears.
Please let me know the results at your earliest convenience. If anything is unclear, please don't hesitate to let me know and I will be glad to help.
I look forward to your reply.
Best Regards,
Simon Wu
[email protected]
Microsoft Windows Vista Support Professional