If you have a separate card from nVidia or ATI/AMD then take Firewall's advice.
If you don't have a separate card and you're just using the onboard graphics controller that came with your motherboard/chipset, then (assuming it's a Dell computer) I'd go to dell.com and see what's available for download for your particular system. I believe you can punch in your machine's serial number there and get a list of all available drivers and updates for whatever hardware came with it.
You can also try running Windows Update, sometimes that will tell you if there are newer drivers out there for your hardware.
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