I just transferred all of my iTunes data and stuff to a new computer and that went swimmingly. The problem now is when I connect my iPhone (iPhone 4 connecting to Windows 8.1) iTunes doesn't recognize it's there and thus I can't sync it to iTunes or anything. I plug it in and instead it opens up the folders on it as if I plugged in a flash drive. Does anyone know of any ways I could solve this?

EDIT: I followed some links you guys showed me andfoud that my Mobile Device USB Driver was downloaded but not installed. It was stupidly complicated but it's working now! Muchas gracias mi amigos!