Device drivers are a set of software instructions that control the interface between a computer and a connected peripheral device. Device drivers tell your machine what the device is, what the device does, and all the other instructions needed for proper operation. For instance, Windows does not ship with a specific device driver set for all the features in your new Logitech keyboard that has custom buttons.
Ref:
http://www.driverstorer.com/help.html
what is the meaning of the system device
it means that the driver of that device is either not loaded or not properly loaded.. load the driver once again from the driver disk and the sign will go off..
No, the device driver is not uninstalled.
What is the best way to change a device driver?
roll back reverting the driver
The device driver tool used to replace a current driver with a previously functioning one is called "Device Manager" in Windows. Within Device Manager, you can right-click on the device, select "Properties," and then navigate to the "Driver" tab to find the "Roll Back Driver" option. This allows you to revert to the last installed driver, which can resolve issues caused by the current update.
device manufacturere most of the time..
How to backup device drivers in win7
Device Driver
airbag
Himem.sys
Himem.sys