If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix. This hotfix might receive additional testing. Apply this hotfix only to systems that are experiencing this specific problem. However, this hotfix is intended to correct only the problem that is described in this article. Hotfix information for Windows VistaĪ supported hotfix is available from Microsoft.
Most systems have only one or two EHCI host controllers, so this should not be too difficult. Note To obtain and, open the Device Manager property page for each EHCI USB host controller, click the Details tab, and then select Device Instance Path in the list. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\PCI\\\Device Parameters To resolve this problem in Windows 7, add a EnHcSoftRetry registry entry with a DWORD value of 1 under the following registry subkey: The problem does not occur when you transfer files to a high-speed USB device.įor more information about USB 2.0 data transfer rates, see the "More Information" section.Īdditionally, this problem has been observed on computers that use Transmeta processors (CPUs). This problem may occur when there is lots of traffic on the USB 2.0 hub, and you transfer files to a low-speed or a full-speed USB device.
When you use this Bluetooth device to transfer the files to another device, you may experience the symptoms that are described in the "Symptoms" section. For example, this problem might occur if you use a portable computer that has an internal Bluetooth radio that is connected to an internal USB 2.0 hub. This issue may also occur if the device is internal and is connected internally to the internal USB 2.0 hub. Therefore, this issue may occur if the device is connected directly to a USB port on the computer. For example, a portable computer may have a single USB bus and may use an internal USB hub to provide two or more available USB ports on the computer. Note Some computers have an internal USB 2.0 hub. Alternatively, when you press a key, nothing may occur at all. When you press a key, the key entry may be repeated many times. For example, the behavior of keys may be irregular. Then, the devices are reenumerated.Ī USB keyboard may stop working correctly. You may receive notification that the USB devices have been disconnected or reconnected. Other USB devices that are connected to the USB 2.0 hub may stop working. The error message that you receive may vary, depending on the device that you are using. You may receive an error message about a delayed write failure. When you try to transfer files, the file transfer fails. When you do this, you may experience one or more of the following symptoms:
You try to transfer files to or from a device that is connected to a universal serial bus (USB) 2.0 hub in Windows XP, in Windows Vista, or in Windows 7. For more information, refer to this Microsoft web page: Support is ending for some versions of Windows. To continue receiving security updates for Windows, make sure you're running Windows Vista with Service Pack 2 (SP2). Support for Windows Vista Service Pack 1 (SP1) ends on July 12, 2011.
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