If you only need basic web browsing, document editing, and light media playback – stick with Windows 7 32-bit or install a lightweight Linux distro like LXLE or Zorin OS Lite . However, if you love tinkering and need 64-bit app support, follow this guide and you’ll have a functional, albeit imperfect, Windows 7 64-bit netbook.
The Acer Aspire One Happy netbook was originally designed for Windows 7 Starter (32-bit) , but its Intel Atom N550 processor supports 64-bit architecture Download Driver Acer Aspire One Happy Windows 7 64 Bit