I have a advent l7300 laptop and several keys don't work. I don't know if it is because my daughter downloaded a key locking programme or if the keyboard is damaged. She deleted the programme but never uninstalled it. She then re-partitioned and formatted the hard-drve and put the operating system back but the keyboard has lost letters, c, v,e,etc. Is there anywhere a second-hand or new keyboard can be purchased? I have tried the advent website and asus to and several parts sites to no avail. Thanks, tony.