Do I need an installation disk to buy windows 8

[gabe1844]

Ok, so I'm going to be building a PC soon. I was wondering if I would need to buy a full copy of windows (windows.com) or if i can just buy an installation code off of G2A and put it in. If you need more specifics just list them below. Any help is appreciated.
Thanks

 

[Dan425811923]

you need a ISO image and a code.

 

[N3rdR4ge]

you can buy from g2a, but i would never recommended it. you never know what has happened with that key. they can sell it again a week later and invalidate your copy. they could be selling a unlimited use code that windows will eventually realize and deactivate it.

you should only buy windows from microsoft.com or a boxed, unopened copy from a trusted online retailer. why spend 90 on a non-legit copy with the chance to lose your money? just spend the extra.