I’d find out the make and model of the graphics card either by looking at the specs of your computer model or by running a system analysis tool like Belarc Advisor. I’d then look on the card or chipset manufacturer’s website for the most up-to-date driver, download that to the desktop folder and then open Start Menu > Control Panel > System > Device Manager, and right click on the graphics card and select ‘Update Driver’. Tell it not to connect to Windows web search for drivers, and choose ‘Select the location automatically’. Then browse through the file tree and select Desktop and press OK. It should pick up the new driver there and install it, and once that’s done it should hopefully stop bugging you. If it’s a desktop machine and the problem continues, I’d recommend you buy a new graphics card and fit it, as this is really very simple (just large scale meccano really) and would certainly fix the problem. If it’s a laptop replacing the hardware is probably not an option.