Ok, in this case I suggest that first check your Windows Firewall and make sure it is on and running and update your Windows . I also suggest that update your Java and Adobe Flash player by try to install latest version. As long as this hacking scenario is mostly related to Facebook, I suggest to file a report to Facebook.
You could try to use :
http://www.facebook.com/help/?page=420
And try to file report against this user as abuse. You also could report this to your Internet Service Provider (ISP) and ask them to help you more about this issue. Depend on your country , there might be organisation who are doing legal action against hacking, you could ask your ISP to hlp you with that.