Recently bought an Acer desktop. The keyboard has

Recently bought an Acer desktop. The keyboard has a couple of issues. Firstly the " and @ on the keyboard are transposed on the screen - ie I press the @ key and I get the " symbol on screen. Also the pound sterling icon (shift and 3) gives me the # symbol. The # keyboard gives me a \ on screen. Any ideas? I've gone into Control Panel and all the settings are in UK English and the drivers are up to date. It's a new PC and therefore a USB keyboard.
Thanks