I need help trying to fix this problem asap please

i've been having a problem trying to figure out how to get mypassport harddrive to function correctly again..it's been loading onto my computer but shows as a folder instead of it's usual drive form...and i would like to know where or who can i talk to to help me fix it back to the way it was so i can access all my files again..it's very depressing not knowing how to fix this situation