Think I found an answer:-

go to Documents & Settings>My Documents>My Music>iTunes

Create a folder for each itunes user (3 named folders)

Close itunes and then copy the .xml and .itl files from the My Music>iTunes folder to the named folder of the last user of iTunes

delete or move the .xml and .itl files from the itunes folder (I simply moved them)

Run itunes and library is empty. load the music from the second user by using add files and add folders in itunes, browse to the second users library for these. Load them into iTunes then close iTunes

moves the .xml and .itl files in my music>iTunes to the relevant username folder you created here. run itunes again and library is empty. Do the last 3 steps again for the third user.

Once all three users xml and itl files are put into their username folder in Doc & Settings>my music> iTunes you then simply load the two relevant files for the user who wants to update their music in iTunes and their library is loaded.

Cant find a quicker way but this works.

Rebel

Well done Rebel.

I've had this problem as well, and this will be a major help.

I think the only quicker way would be to write a batch file, which would take more effort then this.

Again, well done.