I need help. I seem to have downloaded some kind of virus possibly because I had my Windows Firewall turned off . I'm not sure.

Now IE defaults to www.needupdate.com and I can't reset it back to my default homepage.

The web page claims to be "Security Center - Microsoft Internet Explorer", is telling me it has detected SpyWare on my PC and is inviting me to download anti-spyware. It says "Your private info is collected by W32.Sinnaka.A@mm"

Can anyone advise me how to fix this?

Thanks.

Trevor