I installed windows 8.1 on my netbook, acer aspire one ao531h-0bk which has a highest resolution of 1024x600. However I went to Screen resolution settings and I noticed that the resolution was 800x600. I have the option to change it from 640x480 to 800x600, but 1024x600 is not available. How can I fix it? In both Ubuntu and windows 7, which I have installed, have their resolution on 1024x600 by default, so don't tell me that my netbook doen't support that resolution.
Most screen resolution issues on laptop computers are due to the video driver.
For the ACER Aspire One AO531h, Acer official support only provides drivers for Windows XP and Windows 7, so I would recommend you to try the official Intel driver for Windows 8. Just download and install the Intel Driver Update Utility, it will detect your hardware and will let you install the latest version of the specific driver you need.