Viewing Server 2008 R2 Roles shows "Error"

Two posts in one day.  That might be a new record for me.

I had a 2008 R2 server that wouldn't install Roles properly via PowerShell.  When viewing the Roles with Server Manager, it simply said "Error".  How useful.

Looking in the event log I found this:

Log Name:      Application
Source:        Application Error
Date:          12/30/2010 11:18:47 AM
Event ID:      1000
Task Category: (100)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      server.domain.loc
Description:
Faulting application name: TrustedInstaller.exe, version: 6.1.7600.16385, time stamp: 0x4a5bc4b0
Faulting module name: ntdll.dll, version: 6.1.7600.16559, time stamp: 0x4ba9b802
Exception code: 0xc00000fd
Fault offset: 0x0000000000051ae3
Faulting process id: 0x9fc
Faulting application start time: 0x01cba845913dc3d6
Faulting application path: C:\Windows\servicing\TrustedInstaller.exe
Faulting module path: C:\Windows\SYSTEM32\ntdll.dll
Report Id: dc0dfe78-1438-11e0-8fd9-0050568900bb
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Application Error" />
    <EventID Qualifiers="0">1000</EventID>
    <Level>2</Level>
    <Task>100</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2010-12-30T17:18:47.000000000Z" />
    <EventRecordID>1935</EventRecordID>
    <Channel>Application</Channel>
    <Computer>server.domain.loc</Computer>
    <Security />
  </System>
  <EventData>
    <Data>TrustedInstaller.exe</Data>
    <Data>6.1.7600.16385</Data>
    <Data>4a5bc4b0</Data>
    <Data>ntdll.dll</Data>
    <Data>6.1.7600.16559</Data>
    <Data>4ba9b802</Data>
    <Data>c00000fd</Data>
    <Data>0000000000051ae3</Data>
    <Data>9fc</Data>
    <Data>01cba845913dc3d6</Data>
    <Data>C:\Windows\servicing\TrustedInstaller.exe</Data>
    <Data>C:\Windows\SYSTEM32\ntdll.dll</Data>
    <Data>dc0dfe78-1438-11e0-8fd9-0050568900bb</Data>
  </EventData>
</Event>

Generally, this seems to happen when the install process is interrupted (hard stopping a VM or a server losing power during an install).  Here are the steps taken to resolve the issue:

1. Installed the System Update Readiness Tool for Windows Server 2008 R2.  This tools runs when installed, so you don't have to actually run it.
2. View the resulting log file (%SYSTEMROOT%\Logs\CBS\CheckSUR.log)
3. Found the offending files:

Summary:
Seconds executed: 131
Found 1 errors
  CBS MUM Corrupt Total count: 1

Unavailable repair files:
    servicing\packages\Package_for_KB2207566_RTM~31bf3856ad364e35~amd64~~6.1.1.0.mum
    servicing\packages\Package_for_KB2207566_RTM~31bf3856ad364e35~amd64~~6.1.1.0.cat

4. Change permissions on the %SYSTEMROOT%\servicing\packages directory to allow administrators Modify rights.
5. Copy the offending files from a different Server 2008 R2 server to the %SYSTEMROOT%\servicing\packages directory on the problem server.
6. Reinstall the offending package (in my case KB2207566).
7. Re-run the SUR Tool (by re-installing it).
8. View the resulting log file (%SYSTEMROOT%\Logs\CBS\CheckSUR.log)
9. Verify the errors have been resolved:

Summary:
Seconds executed: 211
No errors detected

10. View Roles with Server Manager.