I have a Toshiba laptop with a DVD-R/RW drive but when I put (2 different types of) DVD+RW disk into the drive, it dosen't read my disk and spends a lot of time 'thinking' by making sounds of reading but not doing anything. Why dosen't it read my disk? Do I need to install another program. Strangely it did read a DVD+R disk. It also reads and plays DVD movies without a problem.