Error message when trying to start sdl studio 2017

Suddenly when I try to open my new sdl studio 2017 I get the following error message: An unexpected error has occurred while loading the application plug-ins. 

<SDLErrorDetails time="05-02-2017 15:02:31">
  <ErrorMessage>An unexpected error has occurred while loading the application plug-ins.</ErrorMessage>
  <Exception>
    <Type>System.IO.IOException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
    <HelpLink />
    <Source>mscorlib</Source>
    <HResult>-2147023779</HResult>
    <StackTrace><![CDATA[   ved System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   ved System.IO.FileSystemEnumerableIterator`1.MoveNext()
   ved System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   ved System.IO.Directory.GetFiles(String path, String searchPattern)
   ved Sdl.Core.PluginFramework.DefaultPluginLocator.GetSystemPluginDescriptors()
   ved Sdl.Core.PluginFramework.DefaultPluginLocator.GetPluginDescriptors()
   ved Sdl.Core.PluginFramework.ValidatingPluginLocator.ValidateThirdPartyPluginDescriptors()
   ved Sdl.Core.PluginFramework.ValidatingPluginLocator..ctor(IPluginLocator baseLocator)
   ved Sdl.Desktop.Platform.Implementation.Studio.LoadPlugins(Boolean loadThirdPartyPlugins)]]></StackTrace>
  </Exception>
  <Environment>
    <ProductName>SDL Trados Studio</ProductName>
    <ProductVersion>14.0.0.0</ProductVersion>
    <EntryAssemblyFileVersion>14.0.5760.1</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 7 Professional </OperatingSystem>
    <ServicePack>Service Pack 1</ServicePack>
    <OperatingSystemLanguage>1030</OperatingSystemLanguage>
    <CodePage>1252</CodePage>
    <LoggedOnUser>DIANEMCKENNELL\Think</LoggedOnUser>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ComputerName>DIANEMCKENNELL</ComputerName>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>3636400 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>

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