I recently installed another Mac OS on another disk partition and then later on deleted the system folder (and everything else I installed) normally, but when I tried to empty the trash it said that a couple of files couldn't be deleted because they were in use. I tried restarting, option-deleting, starting from a CD, but nothing would get them from the trash! I then tried Burn! and Norton Utilities deleter, but that didn't work either. I looked around at the files, located in subfolders, and when I tried moving the files from the folders it gave a -110 error. Is reformating the disk the only solution? BTW, the installer CD was a bit scratchy, could that be the cause of the strange files?