USB mouse doesn't work while typing?

Please answer only if you have windows 8

One day i accidentally pushed a setting that said "disable the mouse while typing" on windows 8 and now i don't know how to get back. I try to play minecraft and i can't attack and run at the same time i have to do them separately. Its Really annoying. How do i change this?

I've tried all the suggestions people make, such as this one:
1. I went to "Mouse in Control Panel".
2. I went to the "Device Settings" tab on top.
3. I clicked on the "Settings" button.
4. On the left pane, I expanded "Pointing" by clicking on the + sign next to it.
5. I expanded "Sensitivity".
6. I clicked on "PalmCheck"
7. I took the slider all the way to minimum.

Except i can't find the "device setting" tab on top!

Can anyone help?

Use touch pad when typing see number 5 http://superuser.com/questions/504571/use-touchpad-while-typing
Post the brand, model number as well as OS when asking for help.