To try to make sense of system protection...think of each item listed as a screen, preventing insects from getting in.
The most basic screen layer...is a firewall. This is designed to repel the daily many known threats awating anyone who is on the Internet. In combination with this, I would include a router, for those persons who have broadband and multiple PCs connected.
The next most basic layer of protection are the XP critical updates. These are designed to prevent exploitation/infection by known major malware items which have been documented as attacking known weaknesses in Windows and have managed to get beyond the firewall/router stage.
The next layer of protection would be a reliable, updated AV program that is routinely run on the system.
The next layer of protection would be programs such as SUPERAntiSpyware and Malwarebytes, programs which may catch some of the big fish but will also nail smaller fish who might pave the way for bigger fish.
And, of course, there's the user. The user is the biggest weakness of any system protection scheme...proving always to be her/his own worst enemy. User failure to understand/implement the proper practices...usually result in the infections that we see reported daily.
DCOM, Event ID 10005 data compiled from users: http://www.eventid.net/display.asp?eventid...com&phase=1
Service Control Manager, Event ID 7009: http://www.eventid.net/display.asp?eventid...;source=Service
Service Control Manager, Event ID 7000: http://www.eventid.net/display.asp?eventid...;source=Service
As you can see, there are many causes for these types of errors, including the possibility of malware goofing up the system.
You can find any program mentioned...by using Google. In addition to having their own websites, they are made available at many sites (in the hope of increasing user utilization/protection).