simeon_001, that is weird, mainly because then everyone would report it, and it simply works the same, be it SP2 then drivers or SP3 then drivers. Maybe you did something different this time, anyway slipstream SP3 into the clean, not previously modified SP2, then the drivers. If it fails attach the i386\txtsetup.sif file from that failed ISO for me to look. If that is fine then it might be that the sys file itself got corrupted somehow so you might extract the i386\iastor.sy_ and compare to the iastor.sys from the original driver folder.