A nice case study of an instance where an administrator was debuging a failure in starting windows installer service by using procmon.

Check it out at:

http://blogs.technet.com/b/markrussinovich/archive/2011/11/29/3467449.aspx

Marks's Case of Unexplained series' webinars can be found at:

http://technet.microsoft.com/en-us/sysinternals/bb963887