Warning!!! if you have downgrade bios to f.13 and your computer has shuttedown don`t install XP directly ... retrieve the previous version of bios ( f.2a ) importently by the tool show above . and after that u start install XP because if u didn`t do that your computer will be hunged on HP screen and it will never log to the windows or to the bios option ethier so please do as i said to prevent big troubles thank u