Most Notebook PCs have a Keypad 'Num Lock' which is switched on and off using Fn key + F11 [on a Toshiba for example]
Doing this will casue the keyboard to display
4 in place of
5 in place of
6 in place of
- in place of
1 in place of
and so on
Try toggling off the Num Lock
If this isn't your problem, make sure that you have your Keyboard settings correct , go to Control Panel and also Input Language settings correct go to Control Panel.