I had to format my pc and now itunes says that it has to erase all of my data in iPhone

I had to format my pc and now itunes says that it has to erase all of my data in iPhone...
i have iPhone 4 16GB iOs 5.0.1 (i dont want to upgrade yet)
i was going to transfer some songs from my pc to iphone via itunes with drag n drop style
but didn't worked... then i tried to check the box "Mange music and video manually" and when i pushed "Apply"  iTunes said that it has to erase all of my data....
what can i do to keep my data plz???

https://discussions.apple.com/docs/DOC-3141

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