Consider the following scenario:

• You are running a Windows Vista-based computer.
• You resume the computer from standby (S3).

In this scenario, a bus driver that manages a Network Driver Interface Specification (NDIS) miniport is not loaded as expected. Therefore, a yellow exclamation mark (!) appears in Device Manager next to the device that is driven by the miniport. The driver also displays error code 38 (CM_PROB_DRIVER_FAILED_PRIOR_UNLOAD).

For example, this problem may occur on a bus driver that manages a USB composite device that includes a network adapter.