Exchange Routing Engine will not start (sp2 update)

I would appreciate if you could help me with possible solutions on
solving an exchange problem I recently encountered. I recently applied
Exchange Sp2 and my Exchange routing will no longer start.

I have:

Reinstall Microsoft Exchange server.
Service Pack.

Uninstall / Reinstall all of IIS
Reinstall Exchange 2003.
service pack.

...none of these have helped. I have pasted below the event viewer
result when I click start on the service.

Can anyone help ??






Event Type: Error

Event Source: Service Control Manager

Event Category: None

Event ID: 7023

Date: 1/3/2007

Time: 11:38:40 AM

User: N/A

Computer: SERVER2

Description:

The Microsoft Exchange Routing Engine service terminated with the
following error:

The system cannot find the path specified.



For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.







Event Type: Error

Event Source: RESVC

Event Category: None

Event ID: 116

Date: 1/3/2007

Time: 11:38:40 AM

User: N/A

Computer: SERVER2

Description:

The description for Event ID ( 116 ) in Source ( RESVC ) cannot be
found. The local computer may not have the necessary registry
information or message DLL files to display messages from a remote
computer. You may be able to use the /AUXSOURCE= flag to retrieve this
description; see Help and Support for details. The following
information is part of the event: /LM/RESVC/.

Data:

0000: 03 00 00 00 ....

.

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