The first thing you want to do if you are experiencing a DDoS attack is to sign out of your skype and restart your router (make sure your IP address has been changed, you can use cmd and type ipconfig or just google "my ip" to find out). When you get back online you are going to want to make a new skype and only add people you trust. You can't delete your old skype so instead just remove as much personal information about yourself as possible and don't log back into it EVER.
After you make a new skype you are going to want to set-up a proxy. www.hidemyass.com will give you the best possible proxies for your location. To set-up your proxy you are going to want to pick the best one for your location -
Once you have picked your proxy it's time to put it into effect. To do this you are going to want to open up your new skype account and head over to tools -> options -> advanced -> connection. You are going to want to change the box saying automatic proxy detection to HTTPS and add the proxy you have selected into the Host and Port sections.
The next bit is only viable to those with the latest version of skype installed and if you haven't installed it you should go and do that now and repeat the steps above.
Below the proxy settings there is option to "allow direct connections to your contacts only." You should put this on because it keeps your IP hidden from those who haven't added you as a friend on skype.
When you are finished with all of the above click save and restart skype. Your settings will no be changed.
We are still not done though. People can get your IP just from calling you even if you have all of the above set-up. So the next thing you are going to want to do is head on over to Privacy -> privacy settings and under the "allow calls from..." tab you are going to want to switch it from "anyone" to "people in my contact list only"
If you want to go the extra mile and set-up a VPN I'd suggest you purchase a subscription because most free VPN's are overused and have massive latency issues, but before buying one you should stick with the settings I have provided above and see if that works out.
Hopefully this fixes your problems or prevents you from getting DDoSed. If you have any questions please let me know below!!
Edited by Abolished1, 29 July 2013 - 11:36 PM.