Can somebody know the problem ?

It has been the whole day I am figuring out why I can't I press the 'space' button, why it does not work ? The rest buttons works fine but the space one, not. I am so frustrated, I need to do loads of typing and work. It's a lap top, i vaccumed all the dust,checked the button/s,all is fine.
Now typing desperate from phone which I hate :((.


I would be more then appreciated if you've suggested me what is might be wrong.


Thank you in advance.


P.S. I apoligize if I won't reply you, I hate the keyboard of the phone, I am an old school.


Lilly