Skype announced for the new update for Skype 5.5, this update resolves some problems in previous version.
Skype have released an updated to Windows (18.104.22.168) which includes:
◦Resolves Skype login issue for new installations that have UDP blocked on the network.
◦Resolves video calling issue on some HP/Palm devices.
Click here to download Skype 22.214.171.124.
You do not need to uninstall the previous version, just install the latest version.
Skype recommends that all users update to the latest version available.