You Reply: IP Cloning can only be done if someone has access to your computer, which would indicate that you have a problem with hackers.
Your first line of defence is antivirus software along with a firewall. You may have heard of Norton Internet Security and the reason that people use it, is because it's a well known product, which protects your computer from malicious software (viruses) or people (trojans).
I suggest you invest in purchasing yourself some similar software