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You didn't say Windows what? makes a big difference you gotta know. Have you tried a safe mode start up by tapping F8 a few times key right after Bios screen blanks & before Win. screen appears. Once in the boot menu choose safe mode. Let it boot then try decreasing the video settings & restart. if that"s not the fix restart in SM & uninstall video driver. It should reinstall a working driver on next start up.
First of all you need to know what video card you have. If you have Windows and I assume you do go to Start > Control Panel (switch to classic view) > System click on Device Manager and in the list find 'Display Adapter'. The name of the driver appears. Make a note of it. Go directly to the website of your driver's manufacturer. Follow the instructions to download and install the right driver. Restart your computer to let it take effect.
Warning: this is the manual way to update. If you are not a tech guy, attempting to change video drivers could make your computer inoperable or cause severe problems. As a result, you can rely on a drive detective softwarehttp://www.anysoftwaretools.com/driver-detective.html to help fix the driver issue automatically & accurately.
update graphics card drivers, turn of windows update and shut down unecessary programs when running games, increase the amount of physical RAM and make sure the laptop isn't getting too hot. Check the system for spyware and virus's. Laptops generally aren't great for gaming so if it's new games you are struggling with it might be the laptop simply isn't able to cope.
With your Extensa you should be fine with the video and sound cards, as long as yours meets the 2ghz + 1g RAM, you shouldn't have any problems with the game. If you are, try updating to the latest sound and video drivers. Also, if you're sitting on 1g of RAM now, you might consider bumping it up to 2g. This will help it run smoother and avoid crashing during a gaming session.
you should download and install the software for your computer model that controls the functions like increasing & decreasing screen brightness, switch between screens etc. Try reinstallimg the OS using the recovery CD ROM that came with your computer
Sounds like a malware and/or virus infection. Run the virus scanner, adaware or spybot, scandisk and defrag in SAFE MODE.
Let me know how you make out.
Also, check the device manager for problems, and check if your video adapter driver needs updating