I have just set up my sky wireless router, is it safe?

I have just set up my wireless router from sky. Is it autimatically safe or do I need to add some kind of encryption or get some other software? Can I turn the wirless part off as I have no use for it at present as i'm only running the connected PC? Thanks
Update: I KNOW I MAY BE BEING A BIT THICK BUT HOW DO YOU TURN THE WIRELESS BIT OFF?
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