Simple thing to do is check your hard drive isn't full delete old files and clean registry using something like tweek now or aso or simular application you can get these from download.com then when you have run a delete old files,registry scan and ran a spyware scan defrag your pc [look in start menu under system tools] if you have problems after that check how many mp'3 you have if you have a lot burn them to disc and delete them [but not from the shared folder] then do above again if this doesn't work try doing a virus scan if this doesn't work i have no idea what it is,Hope thats of some help?.