Monitor driver installation is completed.
Microsoft® Windows® 2000 Operating System 
When you can see "Digital Signature Not Found" on your monitor, follow these steps.
Choose the "OK" button on the "Insert disk" window.
Click the "Browse" button on the "File Needed" window.
Choose A:(D:\Driver) then click the "Open" button and then click the "OK" button.
How to install
Click "Start," "Setting," and then "Control Panel."
Double click the "Display" icon.
Select the "Settings" tab and click the "Advanced Properties" button.
Choose "Monitor."
Case1 : If the "Properties" button is inactive, it means your monitor is properly configured. Please stop installation
Case2 : If the "Properties" button is active, click the "Properties" button then follow next steps continually.
Click "Driver" and then click "Update Driver." then click the "Next" button.
Choose "Display a list of the known drivers for this device so that I can choose a specific driver" then click "Next" and then click "Have disk".
Click the "Browse" button then choose A:(D:\Driver).
Click the "Open" button, then click the "OK" button.
Choose your monitor model and click the "Next" button then click "Next" button. 
Click the "Finish" button then the "Close" button.
If you can see the "Digital Signature Not Found" window then click the "Yes" button. And click the "Finish" button then the "Close" button.
Microsoft® Windows® Millennium Operating System 
Click "Start," "Setting," and then "Control Panel."
Double click the "Display" icon.
Select the "Settings" tab and click the "Advanced Properties" button.
Select the "Monitor" tab.
Click the "Change" button in the "Monitor Type" area.
Choose "Specify the location of the driver."
Choose "Display a list of all the driver in a specific location." then click the "Next" button.
Click the "Have Disk" button.
Specify A:\(D:\driver) then click the "OK" button.
Select "Show all devices" and choose the monitor that corresponds to the one you connected to your computer and click "OK".
Continue choosing "Close" button and "OK" button until you close the Display Properties dialogue box.
Microsoft® Windows® NT Operating System 