BBC NEWS | Technology | Warning over fake Windows update: "Users are being warned to watch out for a fake Microsoft security update.
Circulating as an e-mail the fake message points people at a bogus website that claims to host critical security updates.
But anyone downloading from the site will get a virus installed that opens a backdoor into their computer the program's creators can exploit.
Security firms and Microsoft urged users to ensure they visit legitimate sites when downloading updates... Anti-virus firm Sophos spotted the e-mail which uses subject lines saying 'Urgent Windows Update' and 'Important Windows Update'"