Every time I want to insert the @ symbol I have to press "Shift & the 2 button".
The symbol above the 2 key shows is " But if I press the key that has the @ symbol it prints the " symbol. How do I change the settings to correct this?

Check your regional settings in the control panel, as you are set up on the wrong country keyboard mapping.

Thanks Curlyben,
I shall try that and let you how I get on.

All I had to do with my keyboard was press "Fn" + "F11 (NumLock)" then it was back to normal. But also try "Fn + F12" or Regional Settings in Control Panel if "Fn+F11" doesn't work.