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USB not detected on Windows 7

Hi.

I had Windows XP installed on my computer. Recently I upgraded it to Windows 7. All is working fine except USB devices (pendrives, etc...) which are not detected. They worked before on Windows XP so I'm sure it's not a hardware problem.

I succesfully installed motherboard drivers. Motherboard is Gigabyte GA-E7AUM-DS2H

Any idea of what could happen and how can I solve it?

The only USB device which seems to work is my mouse.
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Do you run 7 x64 or x86?
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It's 64x

When I connect a USB pen-drive it doesn't appear on "My Computer".  I have already installed this realtec audio driver.

On Device Manager all seems ok except an "unknown" device which appears with a warning sign.
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ASKER

They are a couple of pen-drives and my VideoCam Sony handycam, which has also an USB cable to connect to computer and pass photos and videos to it. My couple of pen-drives are normal pen-drives and doesn't need any drivers.
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ASKER

My Winodws 7 edition is Windows 7 Enterprise. Could this issue be related to this ? Should I have to enable something?
Pen-drives do need drivers but they are already included in the OS (this is why most pen-drives don't ask for drivers). USB devices do not work because USB does not work because there are no USB drivers.
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ASKER

I tryied to unplug mouse and plug on other USB slots. It doesn't work but not only this: keyboard stop working when I did this.

I then plug my mouse again on its original USB slot but it also doesn't work, so I had to restart computer by pressing the "reset" button.

I then remove all USB hubs and, after this, pendrives start to be recognized. Thanks all of you for your help.
Won't hurt if you:
- first, try automatic install the MISSING device drivers
- then automatically update, one-by-one, each USB-related drivers in device manager, by clicking each one, then select UPDATE DRIVER
- also try Windows Update, and see under Recommended updates, if there is some USB or mainboard related update available