Memory should be the first thing to check. In second place seems to be the display driver, meaning that after an upgrade, there could be a substantial improvement. The problem is that those upgrades are that easy to come by. There are a lot available on the Internet, but you must make very sure that it's suitable for your system. The safest option is to contact the manufacturer of your PC (not of the driver) to know what you can do. But not all manufacturers are easy to contact, and some are reluctant to help you or just plain incompetent. Maybe your retailer can help you.
(If you don't know which display driver
you have: go to the Control Panel, Display, Settings.)
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