43b7af74_vices_List___Overclockers_Club__Notes
[Service Name] Portable Media Serial Number [Recommended Setting] Disable [Notes] 
Retrieves serial numbers from portable music players connected to your computer. Disable it unless something of yours ceases to function properly afterwards. I consider this a privacy risk, as it will be contacting a server on the Internet and telling them what music you listen to.
Windows XP Services Removal Guide » Page 2 - Windows Services List - Overclockers Club
Notes