An ongoing spam campaign is attempting to impersonate Microsoft s security team by mass mailing Conficker.B Infection Alerts that drop a sample of the Antivirus Pro 2010 scareware scam. Microsoft has been advised by your Internet provider that your network is infected. To counteract further spread we advise removing the infection using an antispyware program. We are supplying all effected Windows Users with a free system scan in order to clean any files infected by the virus. The process takes under a minute and will prevent your files from being compromised.
Source: https://threatpost.com/fake-conficker-alert-drops-scareware-threat-101909/72347/