Copy all the files back to your computer, even better if they are still there and merely COPIED to the card and not moved. You will need to format the SD card in the phone, and that will erase all content, so be sure you still have what you want on the card stored somewhere else.
Once the card has been formatted in the phone, it will have created the folders needed for the phone to recognize the files as Ringtones, Notification sounds, Music, Photos, etc. Your contacts may have to be transferred another way - we can deal with that once you get the card formatted and see what DOES transfer and is readable on the new phone.
