If someone tried to hack my PC then how would I know that I am being tracking?is it tooo easy to acess my isp and then to IP adreess.how can I safe my ISP frm hacker?if it is hacked how would know that I am being hacked

Some things you should be doing:

1. Be sure you're running a firewall on your PC.
2. Run antivirus software, and set it up to scan any downloads. AVG Free (http://free.grisoft.com/) is a good option.
3. Run spyware/adware detectors regularly (at least once/week). I recommend running both AdAware Free (http://www.lavasoftusa.com/) and Spybot S&D (http://www.safer-networking.org/en/index.html), since they tend to find different things in my experience.
4. Run Windows Update regularly (at least once/week).
5. Set your email client to display messages as plain text, not HTML.

Vasily

Some things you should be doing:

1. Be sure you're running a firewall on your PC.
2. Run antivirus software, and set it up to scan any downloads. AVG Free (http://free.grisoft.com/) is a good option.
3. Run spyware/adware detectors regularly (at least once/week). I recommend running both AdAware Free (http://www.lavasoftusa.com/) and Spybot S&D (http://www.safer-networking.org/en/index.html), since they tend to find different things in my experience.
4. Run Windows Update regularly (at least once/week).
5. Set your email client to display messages as plain text, not HTML.

Vasily
Do everything on that list that he said, you may also want to try changing your ip address. A hacker kept repeatedly trying to hack my computer (my protection plan stopped it), changing my IP address stopped the annoying popup windows saying "this ip address is trying to access your comptuer."