no booting of any kind i get this message with the blue screen;stop c000021a system error status 0x00000000 (0x00000000 0x00000000)this is a gateway laptop model mt6840 googled a few hour but did not find any usefull answer,beside format and reinstall,this laptop was downgraded from vista to xp so i don`t really like the thought of chasing all tha drivers and reinstalling,so hoping someone can get a easy fix if possible and i would be a very happy man,Claude