Can't sync songs from itunes to iphone?

My pc was wiped due to a virus but managed to save all songs in itunes to a memory stick. When i downloaded itunes again and copied the songs over they won't sync to the iphone and an exclamation mark appears next to each song (over 500) how do i find where they are. Idiot proof answers please as i'm not computer savi!

Double click the song, click locate, it'll be wherever you copied them to. 500 times. Have fun!

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