please help aser aspire XC-603

hi guys iam big problem aser , computer have windows 8.1
problem is infected and delete os , iam insert others dvds windows x64 no work
iam views replys , aser big problem , mention update bios , cms , problem mi computer not have OS ,
insert boot . one guy in forum , mention 1 solution install ubuntu 14.04 , x64 , ubuntu work ,
problem need windows 8 , in ubuntu no work exes update bios , need windows 8 x64 original iso u other solution

thanks , reply , more thanks

Hello john,

You can download windows 8.1 and it will setup on your system..

Link in my sig below

How to download and clean install Windows 8.1 if you have an OEM computer with UEFI firmware (BIOS) embedded Windows 8/8.1 product key. -> link

Windows 8.1 installed but when I went to update it won't finish rebooting stuck at 6%. Only had it 1 month. What is the WORST that can happen if I unplug and plug back in. Someone with an Indian accent said I have to pay more money while it is still under warranty?

I made a backup right before it happened, trying to get it all set so it WOULDN'T crash