Well if you had a static IP that wouldn't work, Just ring/email your ISP and say a hackers got your IP and if they could change it and/or get a firewall
ur an idiot...how exactly do you know you got hacked? For all you know, one of your siblings could have opened up WORD and typed "you got hacked".
If your computer hasn't been damaged in any way, you should just have to renew your IP and check/get rid of any viruses that are on your computer.