MCMS issues: cannot run SCA

Recently had a problem with Microsoft Content Management System, where it was erroring-out on the Server Configuration Application. Kept getting this error:

Error: File /NRConfig/SCAConfigMain.asp Unexpected error. A trappable error (C0000005) occurred in an external object. The script cannot continue running.

Best thing I did was look at the System event logs. Found a couple things. There was this error:

The machine-default permission settings do not grant Local Launch permission for the COM Server application with CLSID
{0040D22F-54A1-11D1-9DE0-006097042D69}
to the user NT AUTHORITY\NETWORK SERVICE SID (S-1-5-20).

Found the resolution for that in the MCMS FAQ topic "Problems with SiteManager after installing Windows XP Service Pack 2":

1. Open Component Services, drill down to My Computer, right click and select Properties.
2. On the COM security tab, select Edit Default... for Launch and Activation permissions
3. Give the Internet Guest User Account (IUSR_... or whatever login was mentioned in the error) Launch and Local Activation permissions.

And then got this error:

DCOM got error "The service cannot be started, either because it is disabled or because it has no enabled devices associated with it. " attempting to start the service AESecurityService with arguments "-Service" in order to run the server:
{0040D22F-54A1-11D1-9DE0-006097042D69}

Turns out the AESecurityService was disabled. It's a required service for MCMS, so I enabled it (set to automatic), and started it.

And then SCA worked. Woohoo! Finally!