RAID is never a substitute for a good backup. RAID arrays can fail.
The drivers for that device are built into the OS and so you shouldnt need to download any drivers in order to get it to work. Is the ministation showing up in My Computer / Computer?
What version of windows are you using? 32 or 64 bit?
When you plugged in the ministation, what are the error messages the computer is giving out?
When I plug my buffalo HD-PE320U2 in my computer it ask for a USB driver.. need help!
Davo is right, the usbstor driver is in your OS. Do any othe USB drives work on your computer? Do you have another computer you could try it on? Also make sure that you have both USB cables plugged in.