all files in the main zip need to go onto the root of a USB stick formatted in FAT32 - if your using a mac go into disk utility erase the drive in MS-DOS (FAT)
extract the zip
copy all files to the USB Drive, do not put them in a folder.
do not extract the cab files, they need to remain cab files, i believe there are a few inf files and a few cabs (been a while since I've done it)
Ben.