MRoogle is also a good tool to search these forums. The link is in my signature.
As there is some conflicting information in your thread title and post, do you want to copy the music stored on your iPhone to your computer (which one btw)?
Or do you want to copy music from one computer to another (which ones btw, even though an iPhone is a computer)?
If it is the first have you taken a look at the plenty of programs you can find via Google, like Senuti or exPod for example?
It might also a good deed to list your computer specs including the OS version and all the software titles you tried but didn't work, so the redundancy of mentioning software titles multiple times can be circumvented.