Mouse cursor moves, but doesn't click

I've installed wubi on my laptop (in windows 7). The installation went fine, everything was working fine, but suddenly my mouse didn't click. The cursor moves, but there's no interaction with the things on the screen. For example, if you move your cursor on the "check again" button up here, its border will become orange. Well, this does not happen on my wubi installation. And, of course, I can't push buttons, place writing cursors, etc... is there anything I can do? Thank you and sorry for my English.