For the Via : it should load automatically during setup
EDIT : I see that it did
For the Promise : if you make the normal drivers floppy, then extract the contents of the 378RAID\Win2003 folder into the ROOT of a second floppy, Vista should be able to load them.
If not, then you should search the web for tweaked drivers that exist, and are Vista-compatible, and perform the same procedure.
NOTE : these drivers available online are tweakware not hackware, as it appears that Promise modified these drivers AFTER getting them properly digitally signed by Microsoft
hmmm, on another forum, someone has suggested that drivers are included in RTM, but do not install automatically -- they are apparently in a "promise technology" folder somewhere in there (am rebuilding my multiboot config, so cannot check this right now) --- I will DEFINITELY be looking for these