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IIS 7 application pool crashing

I am running win 2008 R2, with IIS7.  I have multiple application pools and so far, two separate ones have crashed at different times. This error repeats almost every 30 min in my application event log. Not sure if this error is the cause, but it sure looks like it to me, as there's no other error.  Also, in looking at the event log, it looks like this error was occurring every 10 minutes for a few hours before it crashed.

Log Name:      Application
Source:        Application Error
Date:          5/20/2013 9:51:13 PM
Event ID:      1000
Task Category: (100)
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      webserver
Description:
Faulting application name: w3wp.exe, version: 7.5.7601.17514, time stamp: 0x4ce7a5f8
Faulting module name: nlssorting.dll, version: 4.0.30319.296, time stamp: 0x50484762
Exception code: 0xc00000fd
Fault offset: 0x000020d4
Faulting process id: 0xcc8
Faulting application start time: 0x01ce55decafb105c
Faulting application path: C:\Windows\SysWOW64\inetsrv\w3wp.exe
Faulting module path: C:\Windows\Microsoft.NET\Framework\v4.0.30319\nlssorting.dll
Report Id: 0fd54190-c1d2-11e2-9ce4-001ec9b51edb
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="2013-05-21T04:51:13.000000000Z" />
    <EventRecordID>126537</EventRecordID>
    <Channel>Application</Channel>
    <Computer>webserver</Computer>
    <Security />
  </System>
  <EventData>
    <Data>w3wp.exe</Data>
    <Data>7.5.7601.17514</Data>
    <Data>4ce7a5f8</Data>
    <Data>nlssorting.dll</Data>
    <Data>4.0.30319.296</Data>
    <Data>50484762</Data>
    <Data>c00000fd</Data>
    <Data>000020d4</Data>
    <Data>cc8</Data>
    <Data>01ce55decafb105c</Data>
    <Data>C:\Windows\SysWOW64\inetsrv\w3wp.exe</Data>
    <Data>C:\Windows\Microsoft.NET\Framework\v4.0.30319\nlssorting.dll</Data>
    <Data>0fd54190-c1d2-11e2-9ce4-001ec9b51edb</Data>
  </EventData>
</Event>
ASKER CERTIFIED SOLUTION
Avatar of Meir Rivkin
Meir Rivkin
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Thanks for the suggestion