2. Click the Environment Variables button.
3. In the lower System variables section, click New.
4. Type devmgr_show_nonpresent_devices for the Variable name, and enter
1 for the Variable value. Click OK when you??™re done, and click OK to
close the System Properties window.
5. If Device Manager is open, close and reopen it.
6. In Device Manager, select Show hidden devices from the View menu.
Hidden devices (sometimes called ghosted devices) now appear in Device
Manager with grayed-out icons. Other than the fact that they represent nonpresent
hardware, these hidden entries should behave normally, in that you
can uninstall them, change their properties, or update their drivers.
Interpret Device Manager Errors
From time to time, Device Manager will report a problem with one of your
devices by marking it with a yellow exclamation mark (!) or a red ?— . Doubleclick
the device name, and you??™ll likely see one of the following errors:
This device is not configured correctly (Code 1). This is a driver problem;
click Update Driver to install a new driver.
Windows could not load the driver for this device... (Code 2). Again, try
installing a new driver. If that doesn??™t work, contact the manufacturer of
your motherboard for a BIOS update.
The driver for this device may be bad, or your system may be running low on
memory or other resources (Code 3). Try removing the device (right-click
and select Uninstall), restarting Windows, and then reinstalling the driver.
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