I purchased my 9110i nearly two years ago, since then I have probably built 30/40 machines with a fair amount of HP 9110is added.
Never had any probs with hardware, but plenty with Adaptec Software, I always use Nero, Clone and Feurio ( For Burning Audio), thats it no need for any more.
I think you got to remove the Adaptec Software that came with your machine and I am sure that the firmware that came with my CD Writer was version 1.0c, I can't recall having ever upgraded the firmware.
I have virtually the same setup as yourself, except I have a 1.4AMD chip, I also have the DMA enabled on the 9110i.
I think that a format me be the answer, then install Nero (latest Version) Clone etc, then if your still having problems, send your CD Writer back to HP, they will exchange, or have you emailed them about your probs, if not do so, they willmost probably have suggestions which they will ask you to try, then if all fails they will exchange the old 9110 for another.
Let us know how you fair
Jomo the man