Could you please provide some more information on this like;
What is the operating system you use ?
What type of internet connection (dsl/wireless) ?
What is the brower you use ? (firefox/Internet explorer)
The main interface of your security center , does it say "Am I protected YES" or "Your computer is secure" ?
In addition to what Dinesh wants to know, can you tell me if you clicked "Block" for IE or Firefox in response to either of the the popups which I have attached screenshots of?