so heres what to do
to keep a hacker out is to go to windowsupdate.com and get every update possible for ur comp, then download a port scanner. go to a site like whatismyip.com or ipmonkey.com and get ur ip adress. use the port scanner on ur ip to see what ports are open. if a port is open and you dont absolutely need it, go into ur firewall settings and close that port. to find out what runs on a certain port, just go to google and type in "port " then the port number and search. hope this clears things up.
http://www.s7.invisionfree.com/c*r*br4ls_***rd/index.php
if my post helped you at all id appriciate it if you'd add this to the forums you post at.