Letter keypad is working like Num keypad in laptop

After upgrading windows 10 from windows 7 on my HCL laptop(that does not have separate number keypad), Letters m, >, j, k, l, u, i, o, p, 8, 9, 0 are not working. But these letters are worked like arrow keys and Home, End, PgUp, PgDn keys when Num Lock is off. When Num Lock is on, these letters are worked like numbers, +, -, * . If I want these letters, I should press Fn key every time before I need these letters m, >, j, k, l, u, i, o, p, 8, 9, 0. _Please help me...