You need to configure OBS so that it requires the fewest system resources. May be you get a somehow usable video with your very slow machine if you focus on settings with least resource demand.
You changed settings from the default and worsened resource demand. So create a new profile to get all default settings (your scenes and sources will be preserved).
Make sure your settings are:
Settings > video > Base (Canvas) resolution: 1360x768 (that's your display resolution. Don't set this to the too big 1920x1080).
Settings > video > Output (scaled) resolution:: 1360x768 (the same as the display resolution. Might use 1280x720, but will not really change anything Or use something even lower. The lower the output resolution, the lower the resource demand)
Settings > video > FPS: 30 or 15 or 10. (The lower the fps, the lower the resource demand)
Settings > Advanced > Video > Color Range: Limited (don't use full. Raises resource demand for no visual improvement)
Settings > Advanced > Video > Color Format: NV12 (don't use anything else. Kills performance)
Settings > Output > Output mode: Simple
Settings > Output > Video encoder: Hardware (QSV, H.264)
Settings > Output > Recording > Recording Quality: High Quality, Medium file size (if you record a mostly static desktop and no fast paced game or video, this will result in tiny recording files and decent quality).
DON'T use x264 as encoder.
DON'T use any encoder preset higher than P1 (in case you're exploring the settings), since this has the least resource usage.
DON'T use advanced output mode until you learnt more about how video encoders work.
In case you insist on using a constant bitrate mode (not recommended for recording), set:
Settings > Output > Recording quality: Same as stream
Settings > Output > Streaming > Video encoder: Hardware (QSV, H.264) (yes, this is in the streaming settings!)
Settings > Output > Streaming > Encoder preset: P1 (yes, this is in the streaming settings!) Lowers encoder resource demand. If there is no encoder overload, increase gradually to P2 or P3 or P4, but not above.
Settings > Output > Streaming > Video bitrate: what you like. (yes, this is in the streaming settings!) You set 2000, this is very small and results in mediocre quality, but the recording is reasonably small. If you lower this value, the file will get even smaller, but quality is even more mediocre.
Remove every source except display capture.
Or if you want to capture one app window only and not the whole desktop, remove the display capture source and just use a window capture source.
Either one display capture source and no other source, or one (or more) window capture sources for single apps and no display capture source. But not both.
Don't use any audio output capture source. Instead, configure Settings > Audio > Global Audio devices. Set every device to disabled except the audio device you want to capture. Usually this will be "default" or the Windows audio device you use for Speakers. If you don't intend to record a microphone, set all Mic/Auxiliary settings to disabled.
