New Hardware Wizard

Recently I purchased 2 so called plug and play usb devices. They came with no drivers.
When the wizard starts it cannot find any drivers. If I try to list a specific location
for the drivers on my c: drive, it refuses to allow me to access that drive or select a follder on that drive. Devices that I have used months ago still seem to work. It just refuses to find drivers on new harware.....
1 device is a seagate portable hard drive ( 6.0GB Model # ST660211USB0
If I go to the device Manager and select the device ( yellow Question Mark)
the hardware wizard looks for the drivers but can't find them