Windows thought a device was busy when it is not really busy.

This is a fatal Windows error, typically called a Stop message, Bug Check, or more commonly the Blue Screen of Death (BSoD). The system is in a forced reboot state. Any unsaved work is likely lost.

Solution:-

Solution 1 of 3 - Use Last Known Good Configuration

If you are unable successfully boot into Windows because of the fatal error, Windows has an option to reload registry information from the last successful boot. To revert to the last successful boot:

1. Reboot the computer.
2. Near the end of the BIOS messages or graphic, but well before anything appears from Windows, press the F8 key. You may only have a few seconds to get the right spot to press F8 before it attempts to go into Windows. If the BIOS complains about a pressed key or asks you to go into BIOS setup, you've pressed F8 too soon (Don't go into BIOS setup).
3. When successful, you should see a back screen with white text "Windows Advanced Options". Use the up or down arrow keys to highlight Last Known Good Configuration and press Enter.

Solution 2 of 3 - Uninstall the Last Install
If you can get the system up for more than a few minutes or can use safe mode, try removing the last installed software application or driver.

For removal of an application (Windows Vista):

1. Click on Start, Control Panel, then Programs and Features.
2. Select the software to uninstall and select Uninstall.

For removal of an application (Windows XP):

1. Click on Start, Control Panel, then Add or Remove Programs.
2. Select the software to uninstall and select Remove.

To disable a driver:

1. Bring up the system information dialog:

On the keyboard, press the Windows key + Pause/Break.

or

Select Start, right click Computer and on the drop-down, select Properties.

2. Click on the left side option Advanced system settings (Vista only).
3. In System Properties, select the Hardware tab, then click on Device Manager button.
4. Find the hardware/driver of interest (you may need to expand a choice at the "plus" graphic) and double click the choice.
5. Select the Driver tab. Here you can perform a number of actions such as update the driver, roll Back the driver to an older version, disable or uninstall the driver.
6. Click OK to exit, then close the Device Manager and other previously opened dialogs.

Solution 3 of 3 - Add More Memory

The operating system may have run out of usable memory.

Adding additional memory may solve this problem. This is especially true if your system is configured for a minimal amount of memory for Windows.

Link:-http://www.faultwire.com/solutions_bsod/DEVICE_QUEUE_NOT_BUSY_0x00000002-1017.html