Hi VIVAAN DEV
I am Dave, I will help you with this.
1
Bring up the on-screen keyboard, do those keys work on the on-screen keyboard?
2
If those keys work on the on-screen keyboard, this is most likely not a software issue, connect another keyboard to your PC and check if the keys on that keyboard work.
3
If those keys work on the on-screen keyboard and on another keyboard, then your keyboard has a hardware issue and will need to be replaced, on keyboards diagonal groups of keys not working indicate a problem with the the controller for that group of keys.