I need help! Keys on my keyboard are not working e.g. k comes as 2, j as 1, l as 3, 0 as *...

How can I fix this?

Turn OFF you Num(ber) lock.

Did you install anything new on your PC before this started happening?

Ben11 this is a CLASSIC num lock issue on a laptop.
The mention of the Fn key clearily shows that, NO desktop keyboards have an Fn key.

OK, I didn't pick that up until after I responded!