How come i can't sync my iphone to iTunes?

I connected my iphone to my laptop and it won't sync. Itunes doesn't recognize that the device is plugged in. My laptop knows it's plugged in but it isn't recognized in itunes. I can't find out what's wrong. I even uninstalled it and reinstalled it. I don't know what to do.

Never met this problem with my iTunes and iPhone, sorry!
You can go to the discussion community of Apple, maybe you can find some answers there.