1. Uninstall SIMS Infrastructure (if available) - via Start > Control Panel > Programs and Features)

  2. Uninstall both Microsoft .NET Framework 4 Client Profile & Extended - via Start > Control Panel > Programs and Features

  3. Rename the local SIMS .net folder, e.g. C:\Program Files\SIMS\SIMS.NET to OLDSIMS.NET and the 'My SIMS Documents' directory within the My Documents folder to 'OLDMy SIMS Documents'.

  4. Delete the local C:\Windows\SIMS.ini file.

  5. Reboot the machine.

  6. Re-install the full version of Microsoft .NET Framework 4, which includes both Client Profile and Extended. A standalone installer for Microsoft .NET Framework 4 can be downloaded from Microsoft

  7. Please then run SIMSInst.exe from your SIMS setups directory, tick the 'This computer will be used as a SIMS workstation' check box and complete the installation