I've tried another installation with both the NVRaid and the Sil3114 Raid controllers turned on, and this also went without a hitch. As before I only had one drive connected, so there wasn't any RAID array running.
Today, I've run a third installation with both the RAID controllers turned off, and this also went without any problem.
But to answer my own question about the nVidia Driver packages not including the drivers from the previous packages, I downloaded the driver bundles from nVidia's website and tried a series of installations.
For the second installation with both the RAID controllers turned on, I tried the installations in order of the version numbers. The Bâshrat the Sneaky driverpacks had again installed v5.18 on the PATA IDE interface, and the correct v6.66 driver on the SATA IDE interfaces.
As I had expected, the PATA IDE interface driver got updated to v5.34 with the nVidia Driver bundle v6.66, but didn't change again for the v6.70 & v6.86 driver bundles.
Today, I deleted that partition and ran another installation from the same DVD, but this time installed the nVidia Driver bundles in reverse. v6.86 & v6.70 didn't make any change to the v5.18 driver that had been installed to the PATA IDE interface. This only changed up to the correct v5.34 driver with the nVidia Driver bundle v6.66.
So in conclusion, I'm happy that the Update Pack and Driver packs slipstreamed into my Windows XP installation disc now runs correctly for the A8n SLi Deluxe motherboard without any BSODs, but since each new driver bundle doesn't seem to include all of the drivers from the previous driver bundles that aren't updated, I don't think it is enough to replace an old driver bundle with the newer one within the DriverPacks.
I've not yet investigated whether other drivers are affected by the same problem, because I've focussed on the drivers for the hard drive controllers due to the risk of data corruption.
I've seen from earlier posts that there have been problems with nVidia sharing HWIDs across different hardware? Would this cause problems in using drivers from previous driver bundles within the Driverpacks? Or is this something that I'm going to have to try to customise into my own 3rd party driverpack?
I would think that if this is an nVidia Driverbundle problem that there would be a reasonable call to do this if it didn't cause other problems.