If you have encountered a problem that denies access to driver removal in Windows 7, such as a virus or corrupted operating system, starting the PC in safe mode can alleviate your troubles. Safe mode is a start-up configuration of Windows that uses a bare-minimum number of files and drivers to operate the computer, including problematic programs. Drives allow a hardware device, such as a graphics-rendering video card, to communicate with the other components of the machine. Remove a driver in safe mode using Windows' Device Manager tool.
Click the "Start" button and select "Turn Off Computer" to restart the PC.
Press and hold "F8" on the keyboard before the Windows logo is displayed on start-up to enter the "Advanced Boot Options" screen.
Press the down-arrow key to highlight "Safe Mode Without Networking." Press the "Enter" key to start the computer in safe mode.
Click the "Start" button located in the Windows desktop and choose "Control Panel," then "System and Maintenance," and finally "Device Manager." The Device Manager window comes into view showing a list of hardware device categories.
Click the "Display Adapters" option and then double-click on the name of the graphics card installed on the computer. A device properties window opens.
Click the "Driver" tab within the device properties window and then press "Uninstall." Windows removes the video card driver. Restart Windows normally to return to ordinary computer use.