I was trying to change the screen resolution on my computer and accidently made the screen really bright,?

How do I change it back to normal?I was trying to change the screen resolution on my computer and accidently made the screen really bright,?
Go to resolution and display and then redo what you just did.... Or if that dosesnt work just do a system restore by going to your control panel and it should be around that area... Go back to like yesterday.