Q: My iPhone 4 isn't recognised in iTunes.

My iPhone 4 will just not sync with iTunes! My iPad 2 syncs fine, not a single problem. But my iPhone, I plug it in, it pings, starts charging, recognised by my Windows 8.1 laptop but not by iTunes....it's really stressing me out now! It can still use my shared library on my phone but it's no good when I leave the house as I wiped my music off my phone, as my music was totally out of order, wrong artwork etc so I wiped it hoping I could resync and it would fix it. But no, next time I tried syncing to iTunes, this happens! I've read a fair few threads on problems like this (reinstalling iTunes, deleting and reinstalling devices etc) and I'm yet to find a solution....help, please!!