It appears you have alter the Refresh rate, which should be 85MHz to eliminate flicker for the vast majority of users.
Right click on the Desktop>Properties>Settings tab>Advanced button>Adapter tab>Click on List All Modes.
This lists all the colour settings/resolution/refresh rates that your monitor will support using your graphics card.
Select the most appropriate (say 32bit colour/1024x768/85MHz refresh rate) from the list for a 17in monitor and OK your way out of the Display Properties.
This will reset the monitor and should eliminate the flickering.
By the way this is for a CRT and not TFT monitor...:-)