USB device not recognized!!! PLZ HELP  

With the SIW tool that will show the make and model is in that model. From there you can find the updates needed. I simply find it hard to believe that nothing works at all in every port with just the clean install of 7 alone.

did you try to uninstall the malfunctioning controller?

I can throw a fast install of XP, Vista, and 7 on and have access to any usb drive right off when detected with an NTFS partition on it. You simply make a trip into the disk management to assign a drive letter.

The Windows updates alone should anything needed listed under optional there unless you had a bad install of Windows to start with.

Perhaps one thing you can list here is what devices besides hubs are you plugging in? Does that include usb pen or flash drives, cordless mouse, printer, etc>?

For individual devices specific drivers for that device alone would be the item to look at when seeing the unknown device popup. Once you install the drivers for a specific device when plugged in that should then appear listed in the device manager. For a printer that would be in the "devices/printers" section of the Conrtrol Panel there.

What you are describing is more like recycling the power supply. Once you have everything off and the ac cord unplugged as well as having the breaker on the supply turned off as well you hit the power button on the case when turning the breaker switch back on in order to discharge the caps in the supply itself.

The method is used often when a supply known to be good suddenly won't provide enough power to run the system.