Installing a new version of your computer's Basic Input Output System (BIOS) sometimes is required after upgrading any internal hardware components, as newer hardware isn't always compatible with older BIOS versions. In some cases, however, upgrading the BIOS actually may cause more compatibility problems. If your computer is even worse off than it was before upgrading the BIOS, it's possible to reverse the BIOS update and reinstall the older version.
Open the "Start" menu and select the "Shut Down" option. Wait for Windows to finish shutting down and turn the computer back on.
Press the key your computer manufacturer uses to load the BIOS menu. The most commonly used keys include "F1," "F2," "F10" and "Delete."
Read the entry near the top of the BIOS menu named "BIOS Revision" to see which version is installed. Navigate to the "Exit" tab and choose the "Save Changes and Exit" entry.
Tap "Enter" and wait for the operating system to reboot. Navigate your Web browser to the support Web page for your specific computer model. Click the "Drivers and Downloads" link, or the equivalent option available on your computer manufacturer's Web page.
Select your operating system and language from the drop-down menus. Choose the "BIOS" entry to display a list of BIOS files available to be downloaded.
Locate the BIOS version that was released before your currently installed version. Click the name of the BIOS version and select "Download." Right-click the file and choose "Extract" if the BIOS was zipped, or simply double-click the executable file if the file wasn't zipped.
Select "Continue." Click "OK" and choose "Finish." Shut down the computer again after the BIOS is reversed to the old version. Turn on the computer and access the BIOS utility again.
Tap "F9," or the equivalent option to reload the BIOS utility's default settings. The key at the bottom of the BIOS menu lists which button you need to tap to reload the settings. Exit the BIOS and restart the computer.
If you don't know the model for your computer, open the "Start" menu and click "Control Panel." Choose "System and Maintenance" and click the "System" link. Scroll down to the "System" heading to see your manufacturer and model number information. Some BIOS update programs require you to specify the location of the new BIOS file during the installation process. After clicking "Continue," select "Browse" and navigate to the BIOS folder you extracted. Click the file that is labelled ".bin" and choose "Open."