you were NOT attacked by hacker, Don't worry! The webmaster of this website just changed your register table. Go "start" -> "run...", and type "regedit", then HKEY_CURRENT_USER\Software\Policies\Microsoft, you will see item "internet Explorer", delete it.
everything should be fine then.
good luck!!
Lucky Guy, your webpage has been hijacked. I will let you know how to get rid of it late.
1) you shall install an antivirus to prevent yourself from it late.
2) you shall have a firewall installed on your machine, if you want to surf some restricted zones freely and troublelessly.