OK i surrender

updated to ver 2
I put a red message that will enable to procedure
By default it is disabled so no push acidently
and further more when press to activate a warning message
Also big message in Help file

As for the feature
I was asked by a professional friend "are you sure that a virus will
not penetrate even if the USB disk is full ?"
Well i could not say "YES i am sure" since the virus people are so
clever now a days.
So the only way that is seems to be OK,may be, is to disable writing the USB disk on the PC and the registery is the way to go.

I see that the "read only usb setting" Is not understood.
What this feature dose is to switch ON/OFF a registry flag
On XP when this flag is on the computer where this key is on
WILL NOT WRITE TO A USB DRIVE.