If you're trying to move the actual iTunes "program", then it can't be done.. Likewise with other programs.. If they were originally installed to the C drive, they need to stay there.. The same thing applies to some of the program support folders.. Some are designed to be located on the C drive.
On the other hand, most music files can be moved and stored on another drive as long as the program "knows" where they are.. Correctly "Moving" them should change the registry so the program can find them..
Have you tried a RIGHT click "drag" on the entire music storage folder for iTunes (I believe it resides in the "My Documents\My Music" folder) then drag it to the external drive icon in "My computer", release the mouse button and choose "Move Here" selection from the menu?
Hope this helps.
I'm trying to free up space on my computer, so I got an external hard drive. But when I move files to the new drive (space hogs like Picasa and ITunes) I only seem to be copying to it. Instead of everything going to my E Drive, there is now a file in the E drive and the original C drive. How do I move them instead of just copying them? I've tried clicking on 'move this file' in the My Computer screen and I've tried dragging the file to the E drive while holding down the Alt key and neither worked. I have Windows XP installed. Thanks.