oka habai format karala windows gahuwath awulak wenne na. Mokada oyage Windows eke product key eka loss wenne na. UEFI BIOS nam thiyenawanam normally oya product key eka save wenne BIOS eke. Eka apahu ganna bari wei kiyala hithunoth CMD command thiyanawa product key eka hoyaganna puluwan widihe...