Thank you for responding.
I must have explained the problem very badly.
Vista boots without problem.
However, sometimes the Generic USB Hub will not start. I have looked in 'Device Manager' under 'Universal Serial Bus Controllers' and note that 'Generic USB Hub' has a yellow triangle. This is the problem.
Properties tell me ' This Device Cannot Start (Code 10)'. Driver
is up to date (from searches).
The UPDATE I referred to above is my observation that relates to the operation/non-operation of the mouse. Vista does boot.
If I uninstall the Generic USB Hub driver (via Control panel, Device Manager, USB Controllers) ), then reboot will Vista re-install the driver automatically (mouse connected) Will I need the Vista DVD disk at hand? Is this the best thing to do?
Sometimes rebooting solves the problem!