Links about that at http://www.google.com/search?hl=en&safe=off&q=How+do+I+start+the+Vista+Event+Viewer%3F&btnG=Search
In regards to the WMI error, it would be helpful for a full story about this machine, the trojan that damaged it or the user that was tinkering with services and "more cowbell."
There may be a dependent service but let's note what the stock Services are. I'll give a link but with 5 or more versions of Vista you may have to check into your version and if it matters.
Light reading at http://www.blackviper.com/WinVista/servicecfg.htm
How do I start the Event Viewer service? I am trying to run office 2007 diagnostic to repair it but i'm getting a "permissions" error message. I do a cmd prompt: type service.msc, click start "event viewer" service then i get some other WMI error. Please help.