www publising service stopping

I was wondering if someone can help based on the event logs I posted below. This error is occurring on our hub-transport box which is on a server2008 platform running exchange 2007. This is causing our www publishing service to stop thus not allowing anyone to use OWA. Any help will be greatly appreciated .
 

Log Name:      Application

Source:        Application Error

Date:          10/19/2008 4:56:34 PM

Event ID:      1000

Task Category: (100)

Level:         Error

Keywords:      Classic

User:          N/A

Computer:      

Description:

Faulting application w3wp.exe, version 7.0.6001.18000, time stamp 0x47919ed8, faulting module exprox.dll, version 8.1.291.0, time stamp 0x4836754f, exception code 0xc0000005, fault offset 0x0000000000068541, process id 0x%9, application start time 0x%10.

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="2008-10-19T20:56:34.000Z" />

    <EventRecordID>46693</EventRecordID>

    <Channel>Application</Channel>


    <Security />

  </System>

  <EventData>

    <Data>w3wp.exe</Data>

    <Data>7.0.6001.18000</Data>

    <Data>47919ed8</Data>

    <Data>exprox.dll</Data>

    <Data>8.1.291.0</Data>

    <Data>4836754f</Data>

    <Data>c0000005</Data>

    <Data>0000000000068541</Data>

  </EventData>

</Event>

 

Log Name:      System

Source:        Microsoft-Windows-WAS

Date:          10/19/2008 5:00:24 PM

Event ID:      5011

Task Category: None

Level:         Warning

Keywords:      Classic

User:          N/A



Description:

A process serving application pool 'MSExchangeOWAAppPool' suffered a fatal communication error with the Windows Process Activation Service. The process id was '3752'. The data field contains the error number.

Event Xml:

<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">

  <System>

    <Provider Name="Microsoft-Windows-WAS" Guid="{524B5D04-133C-4A62-8362-64E8EDB9CE40}" EventSourceName="WAS" />

    <EventID Qualifiers="32768">5011</EventID>

    <Version>0</Version>

    <Level>3</Level>

    <Task>0</Task>

    <Opcode>0</Opcode>

    <Keywords>0x80000000000000</Keywords>

    <TimeCreated SystemTime="2008-10-19T21:00:24.000Z" />

    <EventRecordID>9182</EventRecordID>

    <Correlation />

    <Execution ProcessID="0" ThreadID="0" />

    <Channel>System</Channel>



    <Security />

  </System>

  <EventData>

    <Data Name="AppPoolID">MSExchangeOWAAppPool</Data>

    <Data Name="ProcessID">3752</Data>

    <Binary>6D000780</Binary>

  </EventData>

</Event>

 

 

 

 

Log Name:      System

Source:        Microsoft-Windows-WAS

Date:          10/19/2008 5:00:24 PM

Event ID:      5002

Task Category: None

Level:         Error

Keywords:      Classic

User:          N/A



Description:

Application pool 'MSExchangeOWAAppPool' is being automatically disabled due to a series of failures in the process(es) serving that application pool.

Event Xml:

<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">

  <System>

    <Provider Name="Microsoft-Windows-WAS" Guid="{524B5D04-133C-4A62-8362-64E8EDB9CE40}" EventSourceName="WAS" />

    <EventID Qualifiers="49152">5002</EventID>

    <Version>0</Version>

    <Level>2</Level>

    <Task>0</Task>

    <Opcode>0</Opcode>

    <Keywords>0x80000000000000</Keywords>

    <TimeCreated SystemTime="2008-10-19T21:00:24.000Z" />

    <EventRecordID>9183</EventRecordID>

    <Correlation />

    <Execution ProcessID="0" ThreadID="0" />

    <Channel>System</Channel>



    <Security />

  </System>

  <EventData>

    <Data Name="AppPoolID">MSExchangeOWAAppPool</Data>

    <Binary>

    </Binary>

  </EventData>

</Event>