Windows cannot access USB storage disks.

Last Tuesday, all my USB devices worked well.  Now, when I attach a flash drive, windows detects the drive, load the driver, it assigns a drive letter, BUT the drive appears as not formatted with no data.
By clicking on the player will display the message "the disc in the drive that e is not formatted.  Do you want to format it now?'.»
All disks are formatted.  All readers operate in other machines.
All readers will work also in this machine (Dell laptop) IF the laptop is started using a Win7 recovery CD.
USB mouse works
Œuvres for USB keyboard
It's not a hardware problem or a problem of hard drive type.
I have tried the following with no changes:
-Restore to a date before last Tuesday when readers were working.
-Tried to change the drive letter - readers receive a letter and letters of mutation did nothing.
-Check the Device Manager for errors - none is present.
-Uninstalled all attached and only USB devices.
-Uninstalled all USB devices, hubs, etc and restarted - rebuild the USB stack.
-Using the registry manually deleted the USB devices.  HKLM\System\CurrentControlSet\Enum\USB\ and HKLM\System\CurrentControlSet\Enum\USBSTOR
-Manually deleted C:\Windows\inf\INFCACHE.1
-Copied a usbstor.sys from another machine
-Cleaning of registry with ccleaner
-Check the IRQ issues - none apparent.  No 'conflict' have been found.
-Turned off the laptop and pulled the battery.  The Board is reset.
-Windows Update - all to this day.
-A little advice was to roll back SP3 but this laptop does not have a single SP3 spunist.exe.  I could not cancel it.
Does anyone have advice?
The next logical step is the reinstallation of XP.  Ridiculous.

Problem solved!

It turns out it was a rootkit that had messed up my MBR.  GMER found and taken care of him.
Thanks for all your help guys!

Tags: Windows

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