Your DVD/CDROM driver is located at c:\windows\systems32\drivers\cdrom.sys.
If itune has redirected your DVD/CDROM device to a different driver, I suggest, after removing the itune software completely, go to Device Manager and check what driver is listed for the DVD/CDROM. Make any necessary changes to direct the DVD/CDROM device to the c:\windows\systems32\drivers\cdrom.sys driver.