Studio 2015 SP2 CU4 will not open error Studio 4/Studio Menu Maker, urgent please

Hi, I finally decide to upgrade my work environment and it is broken, so urgent assistance appreciated, please. After installing SP2, I got this error, still there after installing CU4. I have upgraded Multiterm, too. See error message detail below. I'm hoping it is a question of cleaning an add on folder, but I'm afraid I don't recall how? Thanks all

<SDLErrorDetails time="08/04/2016 23:15:19">
  <ErrorMessage>C:\Program Files (x86)\SDL\SDL Trados Studio\Studio4\Studio Menu Maker.exe</ErrorMessage>
  <Exception>
    <Type>System.IO.FileNotFoundException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</Type>
    <FileName />
    <FusionLog />
    <HelpLink />
    <Source>System.Drawing</Source>
    <HResult>-2147024894</HResult>
    <StackTrace><![CDATA[   at System.Drawing.Icon.ExtractAssociatedIcon(String filePath, Int32 index)
   at Sdl.TranslationStudio.Start.Help.StartExplorerBarControl.PopulateOpenExchangeApps()
   at Sdl.TranslationStudio.Start.Help.StartExplorerBarControl..ctor()
   at Sdl.TranslationStudio.Start.Splash.SimpleStartView.<.cctor>b__0()
   at System.Lazy`1.CreateValue()
   at System.Lazy`1.LazyInitValue()
   at System.Lazy`1.get_Value()
   at Sdl.TranslationStudio.Start.Splash.SimpleStartView.GetExplorerBarControl()
   at Sdl.Desktop.Platform.WinForms.StudioWindowForm.UpdateActiveView()
   at Sdl.Desktop.Platform.WinForms.StudioWindowForm.LoadViews()
   at Sdl.Desktop.Platform.Implementation.StudioWindow.Init()
   at Sdl.Desktop.Platform.Implementation.Studio.CreateWindowInternal(Boolean setActive)
   at Sdl.Desktop.Platform.Implementation.Studio.Run()
   at Sdl.TranslationStudio.Application.Launcher.RunApplication()]]></StackTrace>
  </Exception>
  <Environment>
    <ProductName>SDL Trados Studio</ProductName>
    <ProductVersion>12.0.0.0</ProductVersion>
    <EntryAssemblyFileVersion>12.2.5087.4</EntryAssemblyFileVersion>
    <OperatingSystem>Microsoft Windows 10 Home</OperatingSystem>
    <ServicePack>NULL</ServicePack>
    <OperatingSystemLanguage>1033</OperatingSystemLanguage>
    <CodePage>1252</CodePage>
    <LoggedOnUser>SIAN\Sian</LoggedOnUser>
    <DotNetFrameWork>4.0.30319.42000</DotNetFrameWork>
    <ComputerName>SIAN</ComputerName>
    <ConnectedToNetwork>True</ConnectedToNetwork>
    <PhysicalMemory>4144356 MB</PhysicalMemory>
  </Environment>
</SDLErrorDetails>

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