Not like a virus or anything, but annoying. Even though I have Tools/Options/Rearrange Media unchecked, the Player DID rearrange all of my music. I have over 100 albums recorded and it created a ton of new directories. What a mess.
On the other hand I actually like this feature. It helps sort out a directory full of random MP3s that you've downloaded or copied from CDs, plus it will download all the album covers in jpeg files. Very cool.