AV for Hudl l 2?

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Wife has a Hudl 2 tablet and spends a lot of time playing games on it.
I've a feeling that she clicks on a lot of things/junk that she would be  
better off not clicking on, but I don't really know.
It seems to be working okay, but she tells me that "little green men"  
sometimes walk across the screen. She sometimes gets prompts to clean up her  
phone as it is slow. Her mobile is turned off, it is not Android as far as I  
know.
I know little about Android or mobile phones.
Do I need to download any of these, or not bother?
AVG would be my choice as I've used it on PC for many years.
http://www.mobuware.net/free-tesco-hudl-device-antivirus-download-4251-all-1-popular.html

Thanks.  



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