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1. Uninstall and reinstall the application
2. Reboot
3. Check if the referenced DLL is missing or not
4. Verify correct IIS settings enabled
5. Windows updates are up to date
6. Reset IIS
   1. at command line prompt running as administrator: IISReset
7. Dependency Walker
8. Fuslogvw
9. Process Monitor
   1. Filters:
      1. Process Name = w3wp.exe
      2. Path ends with <name of dll>
   2. Helpful article
10. Security Policies for application pool user and machine
    1. Local Security Policy
    2. gpresult /s localhost /z
11. check memory and processor availability
12. Process Explorer - use on a machine that works to see the dependencies for the failing DLL
    1. View > Select columns > Process Image > User Name
    2. View > Select columns > .NET > Assemblies
    3. Select w3wp.exe process > right click > Properties > .NET Assemblies

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