Upon installing Itunes on my new laptop, I allowed it to search for and add music files to my library, as I had just copied my music from my old laptop over to this one via an external hard drive. After locating and adding the files, it showed that it had added over 1000 Windows sound effects to my library and every actual song was duplicated. What is the best way to remedy this and regain a neat, organized catalogue of music only, no Windows sound effects?