I recently formatted my laptop and reinstalled Windows 7 - Professional. Amongst other tools I have on each of my computers is Windows Live Writer. Re-installing WLW(I discovered version 14 has been released and trying to launch it, I ran into problems inserting a youtube video link.
The error (below) only happened when I tried inserting a video, via the usual video icon >> video from the web; after which I usually paste the youtube link in the Video web address box.
The error is als follows:
Error starts: --------------------
Description: Windows Live Writer has encountered a problem: Unable to cast COM object of type 'System.__ComObject' to interface type 'WindowsLive.Writer.Interop.Com.IViewObject'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{0000010D-0000-0000-C000-000000000046}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).
Problem signature: Problem Event Name: WindowsLiveWriter Problem Signature 01: ValidateSelection Problem Signature 02: 58 Problem Signature 03: System.InvalidCastException Problem Signature 04: 14.0.8117.416 Problem Signature 05: 2.0.50727.4971 Problem Signature 06: Windows Live Writer OS Version: 6.1.7600.2.0.0.256.48 Locale ID: 1033
Additional information about the problem: LCID: 1033
Read our privacy statement online: http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409
If the online privacy statement is not available, please read our privacy statement offline: C:\Windows\system32\en-US\erofflps.txt Error ends: --------------------
I searched online for a solution for a continuous 24-hours. Solutions / proposals to resolve such issues didnt help. I searched further, until I found info that let me to uninstalled Windows Live Writer, Windows Live Essentials, etc., and then downloaded a standalone version of Windows Live Writer 2011 - which has been working since.
Please if have experienced such an error(above) or you have a better solution apart from using a standalone version, kindly leave a comment.

Comments
And Windows Live Writer relies heavily on it to be able to do the theme detection, HTML rendering and the page preview. Not having a current version will keep Windows Live Writer from starting, or producing weird errors.
Even if you're not using Internet Explorer as your DEFAULT browser, it has to be updated.
Link:
http://bit.ly/fLryAD
You should ensure you do a 'system update' and download the latest version [barf/vomit] of Internet Explorer on to your system.
or
Link to Microsoft to install Internet Explorer…
http://www.microsoft.com/windows/internet-explorer/default.aspx
I hope this helps...
Later,
Larry
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