When I plug in my 8 GB PNY Metal-CPC719N USB drive on my laptop (Acer Aspire 5735Z) I get the "USB Device not recognised" problem.
When I check device management to see whether it is an assignment issue, it is not in the list and regardless of the slot it is placed in, I receive the same message.
However, when I plug it into my tower (Custom built) I do not receive this message and it loads instantaneously. For the record, both are running Windows 7 Ultimate, wih he laptop in 32-Bit and my Tower in 64-Bit.
Try this it sometimes works:Shut off your computer using the shut down , then unplug it from your wall outlet. Let it sit for few minutes and then plug it back in and boot up your computer and try it again.