"antispyware-for-all-com" reads like some form of rogue and nothing to do with MS. I also see that it is often put into hosts files (in exactly the form given) to ensure you don't go there. Many nasties try to kid you that they are MS alerts - I'd avoid it.
What makes you feel it is a "windows security alert" and what were exactly were you doing when this pop-up arrived?
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