Do not just install "over" the old version quite often some files are not updated correct.
Please delete config.xml
To be found in C: Documents and settings → Your profile name → Application data → Skype → Skype User name → delete config.xml any changes manually edited in this config.xml will be lost.
This config.xml will be rebuilt without any data loss, but hopefully error free, with next start of Skype. You only must log in newly and Skype will rebuilt a new and correct config.xml and will download all your contacts.
IF Still not working
Reinstall Skype
- Control Panel → Add/Remove Programs → Use add/remove Skype → Allow deleting personal data
- Now check, C: Documents and settings → Your profile name → Application data → There should be no more any folder called Skype. If still exist→ delete
- Go to C: → Documents and settings → All Users → Application data → there should be no more any folder called Skype.If still exist → delete
http://www.hoverdesk.net/freeware.htm
Install RegSeeker. Go to "Search" in Regseeker Type "Skype" delete ALL entries regseeker was finding.
Install Skype and Reboot