All of them are licensed systems installed clean form Microsoft media though - which goes a long way explaining why there are no problems.
Well I have a solid BSOD on one W7 X64 system which is why I started this case, but the update installed and runs fine on another W7 X64 system of mine. Both were installed clean from MS media and both have a very similar set of applications installed.
Yes, I understand. Unfortunately, drivers also in most cases fall under the category 'third-party software'.
It's gonna take some diagnostics and communication with IHVs to sort this out.