Usb Write Protector ....<cut>
will not write any files to your flash drive, it just make sure your flash drive is write protected in this computer only. So, when you plug the flash drive into another PC, your flash drive may still infected by viruses. So, the best way to protect your flash drive is to install this application to all computers that you may use.
I don't see the point of doing that, the utility would be more obstructive than helpfull in protecting against virii.