While using media player for music, media player froze, now when i go through music icon as soon as i click on a song it says loading song then is automatically kicked off, when i try to go through programs, i click on media player and it does nothing, i just noticed my phone now doesnt ring when i try to change ringtone a caution box appears saying" file corrupted, select different ringtone"

Take all data-backup & get a hard-reset... if you have a virus checking application, check your device for virus/bug ; you can get virus checking applications free from the web for your PDAs... Hard-rest will solve your problems... be sure to take your backup of data & contacts...