Control Panel → Security Center → Change Settings

Regedit → HKLM → Software → Microsoft → Security Center

Edit or create a new DWORD (x32) :

Use 0 to enable and 1 to disable the particular notification.

• AntiSpyWareDisableNotify
  • Alert the absence of an anti-spyware and malicious programs
• AntiVirusDisableNotify
  • Alert the absence of a virus
• AutoUpdateDisableNotify
  • Alert disabling automatic updates
• FirewallDisableNotify
  • Alert the absence of a firewall
• InternetSettingsDisableNotify
  • Alert settings for Internet security
• UacDisableNotify
  • Alert disable UAC (User Account Control)