OK. Some progress report. No luck with replacing the ahcix86.sys in c:\windows\system32\drivers with various versions. Something got broken during the first reboot after adding them. But I do have luck with getting the install disk to load. I had been using an slipstreamed SP3 disk. It worked fine with an Nvidia based system but when I used the F6 to load the AMD drivers it would BSOD. I've seen some other posts in my search for and answer, where the posters reported that strange results were caused by a bad install disk. On a whim, I reverted back to my slipstreamed SP2 disk. It correctly accepts the F6 drivers and continues along to the install choices. So it looks like I'm going to use Repair option to get the drivers loaded into XP. BTW I'm using the drivers that came on the ASUS support disk. They are the latest version that is available from the AMD site also. Specifically, Microsoft Windows miniport driver 3.1.1540.127. The ahcix86.sys is dated 4/8/2009 2:46AM and is 186KB Now here is the rub. XP installer reports that the RAID1 logical drive is corrupt and refuses to install to it. This is not totally unexpected as I've booted the drives in RAID, IDE and AHCI mode many times over the last few days trying to figure this out. I'm open to suggestions and advice on how to clear this up. BTW , this is a multiboot system so I can boot up another OS. Lend your support to one of these options I'm considering, or suggest your own. FYI, there are two WD750 drives configured as a RAID1 Logical Drive Option A: Boot RAID1 array into Win7. Rebuild the logical drive using RaidXpert (AMD RAID management software) BOOT XP Install disk, Install XP onto the RAID1 Drive Option B: Configure drives as AHCI in BIOS Boot W7 with 2 individual AHCI connected drives. Run CHKDSK on each to clean up any error (schedule from W7) BOOT XP Install disk, Install XP onto one of the physical drives partitions Configure drives as RAID in BIOS BOOT into XP Rebuild the logical drive using RaidXpert (AMD RAID management software) Option C: Similar to option B but disconnect the 2nd drive Configure 1 drive as AHCI in BIOS Boot with 1 individual AHCI connected drives. Run CHKDSK clean up any error (schedule from W7) Boot XP install disk.. Install XP onto one of the physical drives partitions Hook up 2nd drive Configure drives as RAID in BIOS BOOT into XP Rebuild the logical drive using RaidXpert (AMD RAID management software) Option D: Your sugestions