i use macfee antivirus still then i think somebody is trying to hack my ip address but i cant find his location could you please tell me which software or security to use to make it solve the problem

Within most operating systems there is still a path to a COMMAND PROMPT which is sometimes called a DOS PROMPT. Once you get there, use these 2 commands:

ipconfig /release

ipconfig /renew

This changes the IPAddress of your internet connection. This will foil a hacker that already has your IP Address.
To prevent future attacks, install a FireWall program from one othe many software providers. Some internet providers provide this protection free but you have to search their website and download the software.