Some laptops keyboards are by default dissabled when another device is used so go into control panel or to the icon in your task bar and look in the properties for an enable. If you are really troubled try to do a system restore, but remove your keyboard before it restarts.
Try going into control panel and keyboards, i am on a mac so i dont remember the exact settng but look through there and see if there is a list to chose what type of keybard you have and whether it is external or built-in. hope this helps
Usually answered in minutes!