Just tried re-running the scan with all 5 drives now powered up and visible within Windows Explorer in Safe Mode with Networking; the only option I realistically have at the moment.
Oddly I still need to hit the cancel button 5 times exactly with each scan in immediate succession, so the number 5 seems to be a coincidence.
I actually don’t think this is anything directly to do with the RAID setup, as all the issues occur post the drivers being loaded, so the Raid aspect should be transparent to Windows.
Nvidia control panel suggests that the RAID array is “Healthy” and “Smart Self-Test” points to both drives being OK as well.
Everythings been stable for ages; this problem only occurred on the re-boot to complete a set of Windows security updates.
Obviously it needed to re-boot following the partial install of these Hot Fixes & Security Updates, as some of the system files which needed updating must have been in use whilst Windows was running normally.
I assume this is where it screwed up and I now get a software clash of some sort when I try and go for the full re-boot; maybe from a driver somewhere?.
I wonder if running SFC might be a sensible option?

I did download a copy of Easeus ToDo Backup Home 6.1 from GiveAwayof the Day recently and immediately did a C drive backup along with creating a recovery disk. That will probably be my final option though as it will obviously overwrite all my existing C drive and prevent any other more simple recovery scenarios.

I did a quick google on that error message and came up with the following site
http://answers.microsoft.com/en-us/windows/forum/windows_xp-system/windows-no-disk-exception-processing-message/b1a67525-d5e8-46ae-9801-6b169547e656
which suggests that it’s related to me inserting and removing a USB stick, which would follow, as I was using one to run frst etc.

See also
http://www.techsupportall.com/how-to-fix-no-disk-exception-processing-message-c0000013-parameters-75b6bf7c-4-75b6bf7c-75b6bf7c/

obviously I don’t know it’s validity, but I did alter the registry key fro 0 to 2 as suggested and then re-started the scan, which ran without interruption. I went for this as I couldn’t access the “remove hardware safely” option in the stystem tray from safe mode.

I suspect therefore that this error message is a red herring.

I can post the results of the last scan if you wish, but can’t seem to add them to this modified message.