I am trying to format the netbook and install Windows 7 Ultimate 64-bit, instead.
Other details:
The netbook has 2 GB RAM.
The netbook initially had Windows 7 Starter (32-bit) installed.
I checked the CPU's specs with CPU-Z. It detects that the processor is indeed Intel Atom N2800, but it does not say that the processor is 64-bit (AMD64 or EM64T):