Answer by  
                                                                                          Snood (55)
                                                            
                          
                          
                                                           Go to "Security Center" (in Control Panel in Windows XP, in Control Panel -> Security in Vista), click "Change the way Security Center alerts me", and select the last option, "Don't notify me and don't display the icon (not recommended)". You know it must be good, because Microsoft don't recommend it!