You may have USB devices set 1st in the boot sequence, but with no bootmgr on the drive, it'll get "stuck".
If the I drive doesn't show when you click Computer, go to Control Panel|Folder Options. In the window that opens go to the View tab, scroll down a bit and tick the button to "Show hidden files folders and drives". Click Apply and exit.
Now with the I drive plugged in, click Computer from the Start button and it should show there now. Just double-click it and you'll find the search box in upper right as in Anak's example.