Choose Windows 7 64-bit from the dropdown menu.
Windows 7 64-bit uses more RAM than the 32-bit version. If your NAV50 only has 1GB of RAM, you may experience significant lag. Optimization Tips for the NAV50 download driver acer aspire one nav50 windows 7 64 bit
The NAV50 was sold with different Wi-Fi cards. If the Atheros driver doesn't work, try the Broadcom version. Choose Windows 7 64-bit from the dropdown menu