I have the same problem. I just got a new laptop with Windows 7 and MS 2010. But it will kick me off after I try to send a message to a friend. I uninstalled reinstalled updated did all the things the problem solver told me to do and still it does not work. FIX THIS SKYPE!!!!!!!
I recommend trying to delete shared.xml first, since it does not involve installs. If deleting shared does not work I also recommend deleting all the folders named after Skype user names. I have used this method many times already. Im just glad an admin finally posted this method.
dl v5.7 beta at link below and your problems will be gone