Can't see my 2TB Mirror Edition My Book Drive on Windows 7 64 bit? Urgent!

i am using 2TB with Raid 0 settings. i installed my driver on Windows XP SP3 and it detected correctly. i copied data from windows XP and then installed driver on my laptop at Windows 7 64 bit.  but there i can’t see my External Hard drive. while WD drive manager shows it.

i ca’t format my drive as i have very precious data on it. kindly some one help me what could be the reason ? 

is there any problem with it’s drivers for 64 bit Windows 7 or some thing else ?

A waiting for your replies