iTunes won't recognize my iPhone!

So I have an iPhone 2g. Yes the original iPhone, a friend gave it to me. I connected it to my mom's mac, everything works fine, and it works fine with pretty much every computer I plug it into, mac or windows. It syncs and everything.
But when I plug it into my laptop, it's a Windows 7 Ultimate x64 Toshiba Satellite L505, it comes up in windows explorer as and iPhone, but does not show up in iTunes. I have tried everything. Starting iPod Service, turning on Bonjour, i got an old iTunes version, but nothing works. I DID manage to get it for a little bit. I just messed around with all the itunes services and managed to get it to work and I was able to add music and my apps and stuff. Then the next day I restarted my comp and stuff, now it's back to not working. I need to be able to sync my iPhone with my laptop. Any help people?! Please.

Thanks you! Worked perfectly. I'm so happy I finally got it after months!