Welcome, RBCC, to MSFN! I'm ignoring the new switches: I liked the old ones fine. Basically, the blue and white iconed hotfixes go in SVC-HF1, the others go in SVC-HF2. I mean, it isn't exactly rocket science, but it works for me. Not sure what the CD you have from Microsoft is, so I don't know. Some people do name the boot image boot.bin. Personally, I name it XPCTBOOT.BIN. Don't know about .ISS files: they are not used by Microsoft for updates/fixes.