COD will not launch

[|450|Devil]

I had to replace my C drive. So I reloaded Steam and COD on the new C drive, However, COD will not launch. All my other games on Steam work OK. I have tried all the suggested fixes. But no luck. Any suggestion would be most welcome.

This is what is in the event log:

Log Name: Application
Source: Windows Error Reporting
Date: 18/07/2012 6:55:54 PM
Event ID: 1001
Task Category: None
Level: Information
Keywords: Classic
User: N/A
Computer: Stephen-PC
Description:
Fault bucket 1835705136, type 5
Event Name: CLR20r3
Response: Not available
Cab Id: 0

Problem signature:
P1: launcher.exe
P2: 1.0.0.0
P3: 4d6e3d08
P4: Launcher
P5: 1.0.0.0
P6: 4d6e3d08
P7: 1
P8: 0
P9: System.BadImageFormatException
P10:

Attached files:
C:\Users\Stephen\AppData\Local\Temp\WER6E91.tmp.WE RInternalMetadata.xml

These files may be available here:
C:\ProgramData\Microsoft\Windows\WER\ReportArchive \AppCrash_launcher.exe_cae1fb844bbfd75777e82b60c6e 4fc23221f3630_0c8779a8

Analysis symbol:
Rechecking for solution: 0
Report Id: 5f744e7a-d0b6-11e1-a381-1c6f65c624ea
Report Status: 0
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Windows Error Reporting" />
<EventID Qualifiers="0">1001</EventID>
<Level>4</Level>
<Task>0</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2012-07-18T08:55:54.000000000Z" />
<EventRecordID>5057</EventRecordID>
<Channel>Application</Channel>
<Computer>Stephen-PC</Computer>
<Security />
</System>
<EventData>
<Data>1835705136</Data>
<Data>5</Data>
<Data>CLR20r3</Data>
<Data>Not available</Data>
<Data>0</Data>
<Data>launcher.exe</Data>
<Data>1.0.0.0</Data>
<Data>4d6e3d08</Data>
<Data>Launcher</Data>
<Data>1.0.0.0</Data>
<Data>4d6e3d08</Data>
<Data>1</Data>
<Data>0</Data>
<Data>System.BadImageFormatException</Data>
<Data>
</Data>
<Data>
C:\Users\Stephen\AppData\Local\Temp\WER6E91.tmp.WE RInternalMetadata.xml</Data>
<Data>C:\ProgramData\Microsoft\Windows\WER\ReportA rchive\AppCrash_launcher.exe_cae1fb844bbfd75777e82 b60c6e4fc23221f3630_0c8779a8</Data>
<Data>
</Data>
<Data>0</Data>
<Data>5f744e7a-d0b6-11e1-a381-1c6f65c624ea</Data>
<Data>0</Data>
</EventData>
</Event>