Windows 7 retail x64 clean reinstall on laptop with Windows 7 OA x86

[kaler0]

Hi, my laptop came with Windows 7 Home Premium OA x86 pre-installed and no Windows disk. After many years of use, I want to do a clean reinstall but I'd like to switch to the x64 Windows, so I've downloaded a retail ISO of Windows 7 Home Premium x64.

With that, a few questions come to my mind:

1- Will I be able to install this retail ISO using my OA key (it is on a sticker under the laptop's battery) or should I modify the ISO's ei.cfg file?

2- Will I be able to activate Windows with my OA license, considering that my laptop originally came with the 32 bits Windows pre-installed and I'll try to activate a 64 bits one?

Thanks in advance.

 

[samuria]

Please read our rules and dont double post

 

[kaler0]

Excuse me, it was my first post and made a mistake. I don't know if it can be deleted.