win8 .ISO help ?

[chromex]

Upgraded from windows 7 ultimate too windows 8 using a product key only.

However i wish too do a fresh install , due too lots of bluesceening.

I brought product key only, so i have no windows 8 disc.

Apparently i can extract .ISO to my USB flash drive then re boot from there?

Problem is i havent a clue how/where the .ISO is?

Thanks for any help or guides in advance

 

[Sovereign_Pwner]

I couldn't for the life of me find how to extract the ISO onto a USB flash drive.

What I do as a rule of thumb, is keep a backup of every OS, and the Product Key I bought for it.

Use a Torrent site, or see if your friend has a copy. That's all I can say, as it was 10 bucks cheaper to get just a key vs a key and a CD.