I have 4th gen nano that won't sync to my new pc windows 7 I transfer everything off my old pc so the music is in my library but it keeps asking me to authorize my acct. which I have 20 times please help

I have 4th gen nano that won't sync to my new laptop windows 7 I transfer everything off of my old pc onto my new one so all of my music was in my itunes library and it still is but when I go to sync new songs it keeps asking me to authorize my computer  and it is already authorize just don't know what to do anymore. Should i deauthorize the 2 computers that it is saying that are authorize and start over? Please help

See here: iTunes repeatedly prompts to authorize computer to play iTunes Store purchases
B-rock

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