with this Microsoft Fixit

Microsoft Fixit

Diagnose and fix Windows security problems automatically

Automatically diagnose and fix problems with security in Windows, such as UAC (User Account Control), Windows Firewall or Data Execution Protection (DEP) to prevent security threats. Find other automated solutions

What it fixes...
  • Checks Windows security features and enables them if needed
  • Phishing or Smartscreen filters
  • User Account Control (UAC)
  • Data Execution Prevention (DEP)
  • Windows Firewall
  • Antivirus protection status and updates

http://support.microsoft.com/mats/windows_security_diagnostic/en-us

Read more about Windows 7 Security

Rob