Cant view the Game but it`s taking space from HDD?

HI i have a weird problem after i copied a game from my friend i went home to install it i found it non existed but the capacity of HDD shows that it`s existed already . how can i view this game ,however it wasnt hidden , but i was hibernating my pc before copying game from him i tried to shut down and re-start nothing appears to shown off , i need help guys