w3wp process crashing with unhandled error

I have recently installed Windows Server 2012 and configured IIS 8 to run. However, when I try to start my website, it gets an error (several times) and kills the w3wp process for the associated Application Pool. It says:

Log Name:      Application
Source:        Application Error
Date:          7/9/2013 8:24:24 AM
Event ID:      1000
Task Category: (100)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      s4.SHW
Description:
Faulting application name: w3wp.exe, version: 8.0.9200.16384, time stamp: 0x50108835
Faulting module name: unknown, version: 0.0.0.0, time stamp: 0x00000000
Exception code: 0x00000000
Fault offset: 0x000007fd816a01de
Faulting process id: 0x1b74
Faulting application start time: 0x01ce7c9f3efb3957
Faulting application path: c:\windows\system32\inetsrv\w3wp.exe
Faulting module path: unknown
Report Id: 7ccee1e5-e892-11e2-93f5-7c050725dd78
Faulting package full name: 
Faulting package-relative application ID: 
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="2013-07-09T12:24:24.000000000Z" />
    <EventRecordID>56914</EventRecordID>
    <Channel>Application</Channel>
    <Computer>s4.SHW</Computer>
    <Security />
  </System>
  <EventData>
    <Data>w3wp.exe</Data>
    <Data>8.0.9200.16384</Data>
    <Data>50108835</Data>
    <Data>unknown</Data>
    <Data>0.0.0.0</Data>
    <Data>00000000</Data>
    <Data>00000000</Data>
    <Data>000007fd816a01de</Data>
    <Data>1b74</Data>
    <Data>01ce7c9f3efb3957</Data>
    <Data>c:\windows\system32\inetsrv\w3wp.exe</Data>
    <Data>unknown</Data>
    <Data>7ccee1e5-e892-11e2-93f5-7c050725dd78</Data>
    <Data>
    </Data>
    <Data>
    </Data>
  </EventData>
</Event>

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followed by:

Log Name:      Application
Source:        VsJITDebugger
Date:          7/9/2013 8:24:24 AM
Event ID:      4096
Task Category: None
Level:         Error
Keywords:      Classic
User:          NETWORK SERVICE
Computer:      s4.SHW
Description:
An unhandled Microsoft .NET Framework exception occurred in w3wp.exe [7028]. Just-In-Time debugging this exception failed with the following error: The operation attempted is not supported.

Check the documentation index for 'Just-in-time debugging, errors' for more information.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="VsJITDebugger" />
    <EventID Qualifiers="49152">4096</EventID>
    <Level>2</Level>
    <Task>0</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2013-07-09T12:24:24.000000000Z" />
    <EventRecordID>56916</EventRecordID>
    <Channel>Application</Channel>
    <Computer>s4.SHW</Computer>
    <Security UserID="S-1-5-20" />
  </System>
  <EventData>
    <Data>An unhandled Microsoft .NET Framework exception occurred in w3wp.exe [7028]. Just-In-Time debugging this exception failed with the following error: The operation attempted is not supported.

Check the documentation index for 'Just-in-time debugging, errors' for more information.</Data>
    <Binary>21400080</Binary>
  </EventData>
</Event>

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Any suggestions on how to debug this?