USB flash drive & external USB drive, windows problems 7

I tried 4 different usb flash drives from different manufacturers and my drive hard usb Western Digital.  Windows 7 recognizes it until I have start the file transfer.  Then, he can not find the drive.  When I unplug it and plug it in again, I get a notification that the USB device is not recognized.  After that I restarted the computer, does the same thing all over again.  I ran Vista before Windows 7 and never had this problem.  I am very frustrated.  Help, please.  I need access to my flash drives & external or Windows 7 is useless for me.  Thank you

Any card motherboard chipset drivers already installed on this PC?  Generally, these chipset drivers help Windows to see integrated devices, including USB.

Tags: Windows

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