Invisible Hd ....helpppp

Hello guys,
Since I have changed the main router all my internal addresses are moved from base to base 10.0.0.x 192.168.xx, so I changed my internal addresses and now the network is perfect.
The problem stems from the fact that my WD Mybook ediction 2 (light blue) is invisible, and is not in any way accessible.
I also did a reset, but can not access the same! the string
  “\ \ Mybookworld” does not work!
Can someone please help me solve the problem?
my OS is xp 64 bit and can be useful if I used the disc perfectly until recently.
thanks in advance

Have you tried connecting the my book directly to the computer and verify if you can access it from there?