Actually, you already gave the best answer when you said,
and not one gives a good answer
If they were not, you would know it.
every thing SEEMS to be working o.k.,
Understand there are generally two versions of Windows 7 drivers, 32-bit and 64-bit. There would not be separate drivers for Windows Home Basic, Premium, Pro, and Ultra, etc. Chipset drivers deal with the fundamental operating system functions of establishing communications between the hardware devices, and not the added and extra software features of the various versions of Windows.
Windows 7 has a huge database of drivers built in, and via Windows Update it can access - it is obvious to me, it has installed the necessary drivers for your system.
There are generally only 3 reasons to upgrade drivers (this includes flashing the BIOS), even IF there are new drivers available (which does not seem to be the case here):
1. The new driver addresses a problem you are having,In your case, there does not appear to be new drivers, and more importantly, you are not experiencing problems - so leave it alone!
2. The new driver addresses a critical security issue,
3. The current driver is corrupt.
If it ain't broke, don't fix it!