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Welcome!What model router is this USB device connected too?
What Hardware version is your router? Look at sticker under router.
Link>What
Firmware version is currently loaded? Found on routers web page under status.
What region are you located?
Has a Factory Reset been performed?
What is the drive size of this USB device?
I presume that if the USB device is working on other PCs and OS's that the problem could be with Vista.