Thanks Trekkie, but I already tried the above method. I still get the same result and error unfortunately after following the instructions.
Do you have IE11 
Do you realise that hes running windows10? Win10 comes with ie11 already.
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Have you by chance renamed Messenger’s executable to something other than msnmsgr.exe? If that’s the case, open the registry editor, head to HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION, then click on msnmsgr.exe and then press F2 to rename it to whatever your new name is. Then do the same for the value at HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_GPU_RENDERING.
If that isn’t the case, could you either screenshot or export your HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_BROWSER_EMULATION key?
No, I can confirm I didn’t touch the registry by myself other than using the downloadable executable you provided on the top of this thread.
As such, here’s a picture of the requested register area:
Hope this helps.
WLM 2009 has tabs. does it work on WLM 2009?