xml import error in itunes - please help

So I had to restore my computer to factory settings. Before I did that I read that I can save my thousands of itunes song ratings by creating a smart playlist for each rating and exporting them to xml.

I've since restored my computer and have added all of my music from my external to iTunes. When I try to import the xml files I've saved I'm getting the followging message 'Some of the songs in the file were not imported because they could not be found'.

Does anyone have any idea what I'm doing wrong? My music was always on my external hardd rive even before the restore and my path in itunes is conneted to my external. I have no idea what to do and am dreading the idea of rating thousands of songs all over again.

Please help! iTunes