what do you do when a hacker hacked on your computer?

Answer 1

Check your internet defences with ShieldsUP!
The Internet's quickest, most popular, reliable and trusted, free Internet security checkup and information service. And now in its Port Authority Edition, it's also the most powerful and complete. Check your system here, and begin learning about using the Internet safely.
https://www.grc.com/x/ne.dll?bh0bkyd2


Install a good firewall
http://users.telenet.be/bluepatchy/miekiemoes/Links.html#Firewalls

Understanding and Using Firewalls
http://www.bleepingcomputer.com/tutorials/tutorial60.html

Online Browser Security Tester
Scanit's Browser Security Test automatically checks your browser for various security problems. When the test is finished you get a complete report explaining the discovered vulnerabilities, their impact and how to eliminate them.
http://bcheck.scanit.be/bcheck/


Even if you run a firewall, keep your virus definitions updated, and don't run attachments that are e-mailed to you, you may still be at risk. Browser vulnerabilities can allow intruders into your system or allow your private data to be read just by viewing a webpage. What follows are a series of browser security tests to see whether you are vulnerable.
http://www.jasons-toolbox.com/BrowserSecurity/

Other helpful information
How did I get infected?, With steps so it does not happen again!
http://www.bleepingcomputer.com/forums/topic2520.html

What is Spyware?
Understanding Spyware, Browser Hijackers, and Dialers.
http://www.bleepingcomputer.com/tutorials/tutorial41.html


Who Writes Malicious Programs and Why?
http://www.viruslist.com/en/viruses/encyclopedia?chapter=153280553

About Hackers and Vulnerabilities
http://www.viruslist.com/en/hackers/info

Answer 2

Disable internet connection; turn off your modem. You should really invest in a firewall so you don’t get hacked at all, or at least be on the safe side.

Answer 3

bring in security updates
change passwords
if you have an updated firewall
he can't hack

Answer 4

If I were a PC user.......

Disconnect completly from the Internet and do a thorough system
check if the damage and corruption is extensive: reformat.