Can't find my iTunes Library?

About a month ago I got an iPhone and I tried to sync it to the same iTunes I have for my iPod and have had for years now. It had all my music and videos on it. When I plugged in my phone something popped up asking me something, I can't remember. But when I clicked it it opened up iTunes 1. I don"t know why the 1 is there, but for whatever reason it got rid of regular iTunes and I can't find it on my computer or within iTunes itself. So did all of my library get deleted or is there a way I can find it on my computer?

I have you have select the option 'transfer purchases', this will cover your iTunes library with your iPhone files. There are no files on your new iPhone, so the original iTunes music and videos got deleted. If the music and video are still on your iPod, you can follow this guide to transfer them from iPod back to computer.