omg....same thing happened to me and i spent an hour googling this issue.
my alpha keys would bring up numerical and/or punctuation. for example, letter "i" would type "5".
How many people have had this problem??
Simple simple SIMPLE answer folks. Are ya ready??
On your Vaio laptop keyboard...upper right hand side of keys....there is the 'Num Lk Scr Lk' button. Simply unclick this so that the light goes out. This keyboard does not require the 'num lock' as regular usb style k/boards do...since there is no right hand numerical keypad.....
Feel free to smack your foreheads at will... I know I did.