I ran into this problem too, if anyone if facing difficulties similar to this just follow the step from this link. You temporarily get to edit it without skype denying you access.
After you update the config.xml template, right-click on it, open properties, and set the checkbox for "read only". That way Skype won't go back and 'fix' it, or replace it with the default template.
Control Panel -> Internet Options -> Security -> Restricted Sites -> Sites -> add g.msn.com and apps.skype.com
Also, to remove the ad placeholder, go to your
and find the line <AdvertPlaceholder>1</AdvertPlaceholder>
and remove the line completely
Thanks so much. I've only put apps.skype.com in the restricted sites list, but the ads seem to have stopped.
When I tried to delete the advertplaceholder line, nothing happened.
To be really clear:
When you open a conversation it should no longer show the ads banner at the top.
If you don't see the banner at the top... then a few moments later it appears... You didn't mark the config file as read-only, allowing Skype to replace the file with a copy of the default file that includes the placeholder.
In addition to having apps.skype.com as a restricted site (Via Internet Explorer as described earlier) I also have it re-directed through my hosts file. If you don't know what that is then google "Windows Hosts file" - It exists in different places on different versions of Windows and we aren't creating a complete tutorial for it here.
# Stop skype ads