Why do I have them?
For the same reason I and everyone else does, because 7 installs base drivers
for just about everything as a "just in case", regardless of the actual hardware. I have those same files as well as some from Intel, Via, SiS, etc all in the,
Personally I would just leave all that well enough alone as it isn't affecting anything as they never get loaded unless the hardware they are for ever gets installed. That and there is a good chance that by removing them that when SP1 does come out it will fail to install due to missing system files (ask those that had that happen after removing various unused driver
files and whatnot with vlite on Vista).