Hello Virago, the issue with the audio and video being out of sync is because they are recorded at different speeds. Sadly, there is no specific settings you can try to overcome this issue, but you can try recording using different formats and encoders. It also depends on the source you are recording from, so you may want to check if the source offers different playback options or if you are trying to record from a web page, you may want to try using different web browsers to open the stream you are trying to record.
If the issue remains, you may want to contact NCH Software support team here Software Technical Support