Database Check Tool: BadImageFormatException

Got the following error and have tried restoring db from backup.  tried reinstalling eM Client.
Looking for help, can’t get past the following error:

System.BadImageFormatException: Could not load file or assembly ‘System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089’ or one of its dependencies. Index not found. (Exception from HRESULT: 0x80131124)
File name: ‘System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089’ —> System.BadImageFormatException: Could not load file or assembly ‘System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089’ or one of its dependencies. Index not found. (Exception from HRESULT: 0x80131124)
File name: ‘System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089’

WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].

   at System.Data.SQLite.SQLiteLog.Initialize()
   at MailClient.Storage.Data.DataStore…ctor(String dbLocation, DataStoreOptions options)
   at DbRepair.CheckingProcess…ctor(IFormCheck view, RepairOptions repairOptions, CorruptionCheckMode corruptionCheckMode, String dbLocation)
   at DbRepair.FormCheck.Form_Load(Object sender, EventArgs e)

I see the references to Fusion!. Is this application running in a virtual machine?