product key allready in use

i just bought a SSD i transferred the files from the old HD to new one ,so i wudnt have to download them again , i had the game working on my old HD so i loged out and deleted steam off of it(i still have windows installed on the old HD) but it still says key is in use already . i dont want a new key i just want to access my account ,my stats were very good (highest rank)

if your gonna email me [edit: email address removed]