Get your device to service centre and get the keyboard check if it is under warranty it is good for you & also try and see driver is up to date or not.
From what I feel, you just have turned your num lock key off, and in keyboards without numpad, numerals are bound to the keys you mentioned. I may be wrong though, so first explain your problem exactly.
Hi Guest we just wanted to alert you to a major change in the forum. We will no longer be allowing the posting of outgoing links. Please use the attachment feature to attach media to your posts.