Then I take my words back.......here i sthe right answer.
It can't be done. The reason for this is that windows loads its own USB driver, and so it has to take the USB offline while it loads it, and so it will stop when it gets to that point.
I recently heard about portable softwares they can be carried in external usb sticks or hdd, never tried any but that might do the job for you. I dont kno who wyou can make installed softwraes portable but there is a lot of them.
Portable firefox
portable nero etc
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