Your brwser has been hijacked.
Try this only if you don't mind changing things in you cpu.
You'll need to edit your Registry for this tip.
1. Changes to the Registry are permanent. Back it up or you'll be outta luck if something goes wrong.
2. Navigate to this string:
HKEY_CURRENT_USER\Software\Policies\Microsoft\Internet Explorer\Control Panel
If the keys for Internet Explorer and Control Panel are not present, add them manually.
1. Right-click the Microsoft key folder and choose New Folder.
2. Name it Internet Explorer.
3. Right-click the Internet Explorer key folder and choose New Folder.
4. Name it Control Panel.
3. Right-click the Control Panel key folder and choose "new DWORD value." Rename the value "Homepage."
4. Right-click the Homepage value, choose Modify, and change the value from "0" to "1."
Now go into your Internet Explorer options. Your homepage is locked and unmodifiable! BE very Carefull when you do this,you can screw up your sytem,but this will take care of the problem.