Provavelmente, o layout do seu teclado foi alterado. Para verificar o layout do teclado
Windows 7 or Windows Vista
1. Click Start , type intl.cpl in the Start Search box, and then press
ENTER.
2. On the Keyboards and Language tab, click Change keyboards.
3. Click Add.
4. Expand the language that you want. For example, expand
French (Canada).
5. Expand Keyboard list, click to select the Canadian
French check box, and then click OK. In the options, click View
Layout to compare the layout with the actual keyboard. In the
Default input language list, click French (Canada) – Canadian
French, and then click OK two times.
6. In the Regional and Language
Options dialog box, click OK.
**Note :** The Language bar appears on the
taskbar. When you rest the mouse pointer over this bar, a tooltip
appears that describes the active keyboard layout.Click the Language bar,
and then click FR French (Canada).
Assim, conforme indicado no exemplo, você pode alterar o layout para o layout necessário. Isso deve resolver seu problema.