Bad news for XP SP2 users new Skype version 6.7 is not compatible with Sp2 .
But don't worry you can use this .
There are two simple ways to use it
By updating your Service Pack
just go to this direct link Direct link .
After downloading the file run it to install and close all other applications save your work a
nd wait to complete the installation.After the installation restart your PC and you have made it .
Now install new version of skype .
By using old version
If you don't want to download SP3 then you should use this version of Skype
that is compatible with SP2.