XBox 360 Media Center Extender Error – SymAddin

Every time I start my XBox 360 as a Media Center Extender (i.e. select “Windows Media Center” from the XBox 360 start screen, which connects to the Windows Media Center I have running using Windows 7 Ultimate), I get an error about “SymAddin”.  If I OK this alert, it goes on its way.  This seems to be related to Symantec Anti-Virus, which I no longer use – I use Windows Security Essentials which works just fine.

I found this blog post which mentions a different problem (ehExtHost) but when I looked at the registry keys mentioned in there, sure enough they relate to “symaddin”.  So I deleted those and my errors are now gone.

One again, a third-party product (in this, case Symantec Anti-Virus) that doesn’t handle properly uninstalling itself – so Windows (in this case Media Center) gets blamed.