Article ID: 911091 - View products that this article applies to.
Consider the following scenario. You purchase a PlaysForSure device or another Microsoft Windows Media Player 10-compatible media device. You install the device on a Microsoft Windows XP-based computer. In this scenario, the device does not appear in Windows Media Player 10 even after the device appears to be installed correctly.
Additionally, you may notice the following behavior after you install the device:
This issue occurs because PlaysForSure drivers in Windows Media Player 10 depend on specific access permissions to information in the Windows registry. Standard registry access permissions are set in Windows XP that enable this driver to work correctly. If third-party software or a device is installed on the computer, the software or device may incorrectly change these permissions. If the third-party software or driver deletes the Read permission for the Everyone group, the PlaysForSure driver can no longer access the registry. Any device that uses this registry information becomes disabled. Typically, devices that are affected by this issue are devices that communicate with Windows Media Player 10 by using the Microsoft Media Transfer Protocol (MTP).
To resolve this issue, change the permissions on specific registry subkeys in the Windows registry. Programs that incorrectly change registry permissions appear to change permissions on either the
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USBregistry subkeys. Registry subkeys within these subkeys generally inherit their permissions from the
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enumregistry subkey. You can restore permissions on these two registry subkeys to reset the permissions on device-specific registry subkeys that are in the
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USBregistry subkey. This change restores correct functions to devices that use the PlaysForSure device drivers. To restore the permissions on the
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USBregistry subkeys, follow these steps:
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows