I did a weird key combination because I was fixing my screen on top of the keyboard and I think it had something to do with that.
Nothing worked, numbers or letters, after pressing shift a couple of times now more letters and numbers work but for example the letter 'd' and some others while on the explorer don't, as it minimizes the explorer and maximizes it again, it should be working as a
shortcut, if you could help me with quick fix
By the way i'm running a windows xp
More aboutcannot type letters keyboard
If 'D' key minimises the explorer, you have Windows key struck (Win+D == Show Desktop)