An Acer XP system has a dvd/rw that has suddenly quit reading cds or dvds. There is no error message, all media appears as blank. I replaced the ide burner with a brand new sata dvd burner and it wouldn't read any disks either! Either burner will boot from a bootable cd so it's not a hardware issue. I have followed various threads on google and have deleted the upper and lower filters with regedit but that made no difference. I have scanned for viruses and spyware and 0 were found, very clean system. VLC media player was installed on computer, I uninstalled it and now I get a Access Denied message when I click on the cd. Any ideas?