Ответ: Чиним скайп
не надо удалять все папки в "документс энд сетингс"
да и shared.xml далеко не у все лежит именно там
http://oreilly.com/catalog/skypehks/chapter/hack45.pdf
Refreshing your list of super nodes will change the way in which your
Skype client interacts with the Skype network. It may change how calls
are routed and have an impact on how many relays (hops from Skype
client to Skype client) you have. Having a new and different super-node
list sometimes improves how Skype runs. To refresh your super-node
list, simply rename or delete shared.xml. The next time Skype starts it
will build shared.xml, and your super-node list, anew.