I have just moved to Windows 7 from XP. I am now getting the same problem (several blobs). Just before upgrading I did a custom configuration for the newly fitted DVD drive I added. The contents of the devicenn.rdi generated under XP is below:
Retrospect and RDU are the same versions.
I tried changing the BIOS but it made no difference. Anyway the BIOS settings caused no problems when running under XP. Is there a Windows 7 specific problem?