How do I fix my number keys

i've had numerous problems with my Dell laptop, the number keys are not working right. For example, I cannot type the number five at all it becomes a seven. I will type them in order from one to zero to show you what happens...

123T4T4Y7Y7]89[0 the number two also turns the caps light on and the number nine turns on the F seven key.

I've also had issues with the entire computer shutting down when I am working on it, it turns completely off and now its started flashing while I am using it too.