USB Modem Drive Name Not Visible


On my laptop I when I connect USB wireless modem of EVO, I find there is not drive letter there with the usb port in my computer. I have tried different things like renaming etc but it does not work.

It works ok with other usbs, and also responds to EVO, its just that if needed say to re-install the software, I cannot access EVO USB drive (though I have obtained the software otherwise, yet its just a bit confusing)

Any one has some idea here.