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.
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!!