I have burned around 15-20 DVDs using CDBurnXP over time. All the DVDs were working perfectly, until one day I reinstalled Windows XP on my machine. Now Windows, detects all of them as blank DVD. To be sure that DVDs are alright, I checked them on my neighbour's MACBOOK. MACBOOK recognises all DVDs perfectly and all data is being shown. Why is it being then shown as blank DVD in Windows?