Error messages while starting MT

When starting MT we get some strange messages, showing here:

<SDLErrorDetails time="13.03.2017 11:55:17">
  <ErrorMessage>Retrieving the COM class factory for component with CLSID {91AE116C-E0CB-4006-9E98-284734C3D4F1} failed due to the following error: 800700c1  ist keine zulässige Win32-Anwendung. (Exception from HRESULT: 0x800700C1).</ErrorMessage>
  <Exception>
    <Type>System.BadImageFormatException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
    <FileName />
    <FusionLog />
    <HelpLink />
    <Source>Sdl.MultiTerm.Client.UI</Source>
    <HResult>-2147024703</HResult>
    <StackTrace><![CDATA[   at Sdl.MultiTerm.Client.UI.Viewer.ScriptingHost..ctor()]]></StackTrace>
  </Exception>
  <Environment>
    <ProductName>SDL MultiTerm</ProductName>
    <ProductVersion>MultiTerm14</ProductVersion>
    <EntryAssemblyFileVersion>14.0.2165.2</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 10 Pro</OperatingSystem>
    <ServicePack>NULL</ServicePack>
    <OperatingSystemLanguage>1031</OperatingSystemLanguage>
    <CodePage>1252</CodePage>
    <LoggedOnUser>DESKTOP-UQD5E35\RE</LoggedOnUser>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ComputerName>DESKTOP-UQD5E35</ComputerName>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>8281872 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>

<SDLErrorDetails time="13.03.2017 11:55:09">
  <ErrorMessage>Retrieving the COM class factory for component with CLSID {91AE116C-E0CB-4006-9E98-284734C3D4F1} failed due to the following error: 800700c1  ist keine zulässige Win32-Anwendung. (Exception from HRESULT: 0x800700C1).</ErrorMessage>
  <Exception>
    <Type>System.BadImageFormatException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
    <FileName />
    <FusionLog />
    <HelpLink />
    <Source>Sdl.MultiTerm.Client.UI</Source>
    <HResult>-2147024703</HResult>
    <StackTrace><![CDATA[   at Sdl.MultiTerm.Client.UI.Viewer.TermViewer..ctor()]]></StackTrace>
  </Exception>
  <Environment>
    <ProductName>SDL MultiTerm</ProductName>
    <ProductVersion>MultiTerm14</ProductVersion>
    <EntryAssemblyFileVersion>14.0.2165.2</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 10 Pro</OperatingSystem>
    <ServicePack>NULL</ServicePack>
    <OperatingSystemLanguage>1031</OperatingSystemLanguage>
    <CodePage>1252</CodePage>
    <LoggedOnUser>DESKTOP-UQD5E35\RE</LoggedOnUser>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ComputerName>DESKTOP-UQD5E35</ComputerName>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>8281872 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>

<SDLErrorDetails time="13.03.2017 11:55:25">
  <ErrorMessage>Retrieving the COM class factory for component with CLSID {91AE116C-E0CB-4006-9E98-284734C3D4F1} failed due to the following error: 800700c1  ist keine zulässige Win32-Anwendung. (Exception from HRESULT: 0x800700C1).</ErrorMessage>
  <Exception>
    <Type>System.BadImageFormatException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
    <FileName />
    <FusionLog />
    <HelpLink />
    <Source>Sdl.MultiTerm.Client.UI</Source>
    <HResult>-2147024703</HResult>
    <StackTrace><![CDATA[   at Sdl.MultiTerm.Client.UI.Viewer.ScriptingHost..ctor()]]></StackTrace>
  </Exception>
  <Environment>
    <ProductName>SDL MultiTerm</ProductName>
    <ProductVersion>MultiTerm14</ProductVersion>
    <EntryAssemblyFileVersion>14.0.2165.2</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 10 Pro</OperatingSystem>
    <ServicePack>NULL</ServicePack>
    <OperatingSystemLanguage>1031</OperatingSystemLanguage>
    <CodePage>1252</CodePage>
    <LoggedOnUser>DESKTOP-UQD5E35\RE</LoggedOnUser>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ComputerName>DESKTOP-UQD5E35</ComputerName>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>8281872 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>
 

Finally, MT starts, but does not open any termbases - it reports a fail in connecting to an unknown server. No server is configured though.

Now we removed all settings files from the known path and even renamed the Multi Term entry in the system registry, to no avail. Neither reinstall nor repari do help also. So how can I get MT (and Studio) running again?

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