Cannot delete multiple files in W 2003

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http://serverfault.com – I am looking at a W2K3 R2 SP2 server that was created from a straight update from a W2K Server. All the folders in all the HDD's are labeled "Read Only" ??? If I try to change their attributes (as Admin) I can go through the entire process, but when done, the attribute did not change??? huh??? Anyhow, it has one folder containing about 5K files and another with 58K files. I need to delete all the mp3 files in those folders (this is *.mp3) but nothing, and I mean absolutely nothing, seem to work. The files were copied from DVD's and CD's. I tried the GUI search / select all files / delete and (HowTos)