Why is HP Photosmart C4780 wi-fi not working with MacBook Air?

My HP Photosmart C4780 and my MacBook Air seem incapable of maintaining a wi-fi connection.
My printer will work with a wired connection but the combined scanner no longer works at all.
I have installed and uninstalled the printer on numerous occasions it works as soon as it is reinstalled but this never lasts.
I am out of guarantee with HP and Apple and have paid HP Several times for help but I am wondering if it would be better to buy another printer.
Any help would be gratefully received.

First try Reset Printing System, a menu choice in Printer Setup Utility. You'll have to re-Add the printers (don't "install" drivers or any software though).

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