I have never played a pc video game before. I inherited a computer that has Left 4 Dead (L4D). I unknowingly removed the STEAM program so now my L4D shortcut does not work and I could not find L4D folder in the Program Files folder even though the Add/Remove program still shows that I have the L4D program somewhere. My son would like to play but I could not even start it now. Would appreciate any help I could get. Thanks! George.