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			If it will run Vista, it will run Win7, IME.  
 
As far as I'm aware, there is NO A-V that hasn't had problems. But both AVG and Avast are reasonably well thought of. And you are incorrect about defender. But do what you will. However, only an up-to-date A/V is of any value at all.
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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