DCOM error

[Brian H]

I am getting a list of error reports in my event viewer
saying:

"Access denied attempting to launch a DCOM Server using
DefaultLaunchPermssion. The server is:20002096.....
The user is unavailable/unavailable, SID=unavailable"

The help & support site simply says "The server process
was started but the server is not responding. A
critical .dll or data file might be missing." However it
does not say how to fix the problem.

What does it all mean and is there any way I can fix the
problem?

Many thanks,

Brian