A quick question or two if I can?
Is the D: drive a separate drive?
If So just unplug it and it can not touched, Not that the Windows 7 installer should touch it anyway.
What Software fails? Try Imgburn from http://www.imgburn.com/
Direct link is: http://www.imgburn.com/index.php?act=download
Guides are here: http://www.imgburn.com/index.php?act=guides for burning
Guide for all else: http://forum.imgburn.com/index.php?/forum/4-guides/
4.2.19 Check For Firmware Updates...
From time to time, drive makers test additional brands of DVD discs and then update their firmware with new write strategies for those newly tested discs, enabling their drives to work with more brands of DVD discs.
This function will help you to see if there is a new firmware available for your drive. You need to be connected to the Internet in order for it to work. The program searches 'Firmware HQ' and shows you available firmware updates for your selected drive. It also shows you the current installed firmware version.
You would start Imgburn, Click Write files/folder to disc, Then tools / drive / check for firmware updates.
I will mention that this is free and is what I use to burn CDs, DVDs, and BluRays. My drives will burn all of these, Yours will not burn BluRay disks.
Worth a try?
What happens is there an error code?