Active Directory Web Services Service will not start

The Active Directory Web Services service will not start on a 2008 R2 server with Exchange 2010.

System Specs: 
Dell PowerEdge T310
Dual Xeon 2.67GHz X3450
24Gb DDR3 RAM
Perc h700/1Gb BBWC 8 disks/ 3 volumes
Server 2008R2 SP1 Rollup 3
Exchange 2010 SP1 Rollup 7

Server has been in production since Jan. 2012 with no issues.

When attempting to start the service manually, I am presented with the error "Windows could not start the Active Directory Web Services service on Local Computer.  Error:1053: The service did not respond to the start or control request in a timely fashion."

Upon inspection of the error log, I see the following errors after a start attempt:

System:
EventID 7009
A timeout was reached (90000 milliseconds) while waiting for the Active Directory Web Services service to connect.

EventID 7000
The Active Directory Web Services service failed to start due to the following error: The service did not respond to the start or control request in a timely fashion.

There are no log entries in the Application log, and there hasn’t been an entry in \Active Directory Web Services log since the end of last month. The last entry is:

EventID 1004
Active Directory Web Services has successfully started and is now accepting requests.

As far as I can tell by looking at the logs and checking AD and Replication, DNS, DFS, and everything else, all systems seem to be working except for ADWS.

I have done the following (in addition to hours of searching and research):

I added “<add key="DebugLevel" Value="Info" />” and “<add key="DebugLogFile" value="C:\ADWSLog\Adws_trace_log.txt" />” to the Microsoft.ActiveDirectory.WebServices.exe.config to enable logging, but the service doesn’t seem to be logging anything.

I have copied the “Microsoft.ActiveDirectory.WebServices.exe” file from another working server.

I have export/imported registry keys from a working server.

I attempted to re-register the ADWS DLLs.

I have uninstalled/reinstalled hotfixes installed immediately prior to the point when the service stopped.

After that I installed all current updates to the system.

I am at a loss here, I have no idea what else to try.  I’m looking for any help or suggestions.

Thanks.