Numeral two and "at" symbol key type the letter "a"

Hello, I have a Toshiba Satellite two one-half years old. Suddenly this morning my numeral two type the letter "a" and the "at" symbol above the two types a capital "A". All other letter and number type correctly. I checked the keyboard language and it is still English. I do have the numeric keyboard on the right side that works correctly but no other "at" symbol to use. (only the online keyboard)

Can someone please help??