Thanks for the suggestion. There are two Intel(R)5 Series/3400 Series Chipset Family USB Enhanced Host Controllers 3B34 & 3B3C on my PC. I disabled 3B34 but no 'disable' option was available for 3B3C. 'Uninstall' is an option for 3B3C but I don't feel
that it should be necessary to uninstall standard drivers when using the Windows Update facility.
Still no change, with KB2862330 reverting changes on reboot.
My PC is a standard Dell Windows 7 professional x64bit and I have no idea what is special about it that prevents this particular update configuring.
As this update was re-released last month it is apparent that Microsoft are aware that there is an issue with this update but evidently finding a solution is more complex.
I have spent too much time on this and have now hidden the update. Perhaps it may not be necessary anyway for my PC.