I moved a webservice from 2003R2 to 2008R2 and now I am getting an error.

I am moving off of a 2003R2 server.

I have a webservice that runs fine on the 2003R2 server, but when I install and use it on the 2008R2 server I get an error.

The webservice seems to not run at all.  My debug and log code seems to not run at all.  

When I go to the event viewer and check in application I see these entries.

First it does this:

Log Name:      Application
Source:        .NET Runtime
Date:          10/28/2015 6:03:38 PM
Event ID:      1023
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      TK0121WB05X
Description:
.NET Runtime version 2.0.50727.5485 - Fatal Execution Engine Error (6CE8FB1E) (80131506)
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name=".NET Runtime" />
    <EventID Qualifiers="0">1023</EventID>
    <Level>2</Level>
    <Task>0</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2015-10-28T22:03:38.000000000Z" />
    <EventRecordID>18973</EventRecordID>
    <Channel>Application</Channel>
    <Computer>TK0121WB05X</Computer>
    <Security />
  </System>
  <EventData>
    <Data>.NET Runtime version 2.0.50727.5485 - Fatal Execution Engine Error (6CE8FB1E) (80131506)</Data>
  </EventData>
</Event>

Then it does this:

Faulting application name: w3wp.exe, version: 7.5.7601.17514, time stamp: 0x4ce7a5f8
Faulting module name: mscorwks.dll, version: 2.0.50727.5485, time stamp: 0x53a121fa
Exception code: 0xc0000005
Fault offset: 0x0002b2ea
Faulting process id: 0x%9
Faulting application start time: 0x%10
Faulting application path: %11
Faulting module path: %12
Report Id: %13

--

I can find no reference on how to fix this.

What can I do?

Jerry