Why is facebook doing this to me?

[Rik]

If you can access your facebook from all computers except one, then that one computer must be infected with some virus. If you don't have a virus scanner, I suggest AVG. It's free and can clean up your computer. Also, be sure to never give out that kind of information, especially to free websites like Facebook. They don't need your credit card details to verify you. I've had hack attempts on my own facebook account. I was able to verify myself through my email and phone.