Several Keys on my Keyboard have stopped working.

[NightBUT]

A few months ago, the following keys on my Laptop Keyboard stopped working: 1, 2, 3, 4, 7, 8, 9, and 0. All of these keys are on the number row. I can still use those numbers by using the number pad on my keyboard, but it's very frustrating when I need to use the symbols on the number row, and I have to search for them online, then copy and paste them. Also, a few weeks ago the left ALT button stopped working. My laptop is about 3 years old, but I've never spilt anything on my laptop, or damaged it in anyway. I've kept it in good condition. I did have to by a replacement battery, I don't know if that would be causing the problem? However, the problem started nearly 7 months after the battery was replaced.

[ApPy10]

Can you please tell us first of all, what is the make or model of the laptop that you are carrying? Well, it could be a software malfunction or either the keys malfunctioning perhaps, so what you can do is first of all go into Device Manager and then try to either uninstall or delete the keyboard and then reinstall the driver for same and see to it whether it works or not? If that is not working then you will need to replace the keys perhaps.