I have a Dell Inspiron E1505 with Sony DVD+-RW DW-Q58A. The drive was reading and writing to DVD-R disks without any fuss till date. I have Windows XP MC SP 3, and several updates happened over the last two weeks from the MS Automatic Update. Now, the drive does not recognize any DVD-R but have NO problem in recognizing CDs, DVD+R, DVD+R DLs etc.
As the drive can read DVD formats, I hope it is not a problem with the hardware. But I cannot get any solution working e.g. uninstalling drive, deleting upperfilter and lowerfilter from the registry etc.