Stuck Key.... What's this???

this is the problem of my keyboard... when i press key "e", it's not working.... but it's typing automatically like this: eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee and so on.....
even my pc is in idle...

Is this really in keyboard problem or it is caused by virus...???

Please help me... am sicked of it...