Pioneer 108d Huge Problem!

Problem: Nero finishies burning sucesfully and when I insert DVD it shows data, but I can not open that data also when turned “verifying” it can not read data! DMA i setup corectly and 108d is master with Teac 52 CD-RW, Win XP Sp2, 2500 Barton,512 Kingston, MSI nForce 2,etc. I have nero 6 6 0 8 - use only Verbatim R- 8x! Pioneer worked perfectly for 7 or 8 months and suddenly nothing! I have read and tried everything from this site about Pioneer 108d and still nothing! Please help !!!