The Windows Update is a good way of keeping the system up to date, but it doesn't always contain all the updates, especially for device drivers. One of the key components of a computer is the graphics chip, Intel GMA500 in the EeePC 1101HA's case. It is not a very powerful chip so any performance improvements for it are welcome. The newest version when I got my netbook was 18.104.22.1689 but the Windows update only offers the version 22.214.171.1245 or something like that. It may not sound like a big jump but it actually improved the Windows Experience Index for desktop graphics from 2.9 to 4.3! Mind you, the scale is from 1.0 to 7.9. The number for gaming graphics was also improved, although very slightly, from 2.3 to 2.4.
To check the version of your driver, open Device Manager, locate 'Display adapters' and double click the Inter(R) Graphics Media Accelerator 500 below it. The driver version reads on the Driver tab.
If your driver is not up to date, direct your browser to the Intel Download Center. Download the win7.zip, extract its contents into a temporary location and run the Setup application. This installs the driver after a few dialogs. The screen will blink during the install, so don't be alarmed. When the setup completes check back in the Device Manager that it really updated the driver. You may now run the Windows Experience Index benchmark yourself to see the improved figures. :)