The Windows Security Center or Action Center is a component included with Microsoft's Windows XP (beginning with Service Pack 2), Windows Vista and Windows 7 operating systems that provides users with the ability to view the status of computer security settings and services. Windows Security Center also continually monitors these security settings, and informs the user via a pop-up notification balloon if there is a problem. It is renamed to Action Center in Windows 7, where it covers maintenance as well as security
But here it used to show the false scan alerts& It is spreading
Winwebsec family Trojans

When the user first accesses a malicious page, It is generating fake virus alert

And it asking to install the rogue system security 2009

After Infected

More on Install.exe http://www.virustotal.com/analisis/cb066f00f4dccdd3f24f5f888843aee5
WHOIS INFORMATION:
Domain name: itsecurityscan.com
Name servers:
ns1.itsecurityscan.com
ns2.itsecurityscan.com
Registrar: Regtime Ltd.
Creation date: 2009-03-25
Expiration date: 2010-03-25
Registrant:
Jayme Millwood
Email: millwoodjaymemichael@gmail.com
Organization: Private person
Address: 1892 C Street
City: Pawtucket
State: MA
ZIP: 02860
Country: US
Phone: +1.5083997660
***** Thanks to Kalyan for his analysis *****