Homepage

Hello Friends,

I'm facing an issue with my hompage. My default homepage was set as www.google.com. However from last friday an unknown site has been set as my homepage automatically (even I've never been to that site earlier). The site name is "zoomshare". Due to this whenever I open my internet explorer, i've taken to that "zoomshare" website. Now I'm unable to set my homepage to default (google).

Even i've re-image the system. Kindly do help me to sort out this issue.

Regards,
Apple.