Windows system32/hal.dll missing,today i help sister run some virus scan and clean up her notebook,then i run disk cheanup and it deleted all system files.and i click restart,and i saw this word "Windows system32/hal.dll missing". i insert the windows xp cd,but it cannot run the instalation. it just come out with this word system32/hal.dll missing . really need help,urgent.. if my computer i can format or give others people repair it. but this is not my notebook. anyone know how to fix it ??