When am typing in excel the charecters are malfunctioned. When I enter-@, its typed as -". Kindly give a suggestion and am checked all the settings in my system. All are OK.

Check your keyboard mapping in Regional Settings in control panel.

Check your keyboard mapping in Regional Settings in control panel.
Maping means:(

Make sure your country is correctly set up in the control panel, regional settings area.

This problem not facing all the times, when am opening four to five excel files it can be working after re-start the system. And suddenly the same problem was came.