Next, enter your HP model number on the right. (1) Once the support page opens please select the country in which you're located. HP Technical Support can be reached by clicking on the following link: If your product is out of warranty, please choose paid options to get the tech support number. Otherwise, you could also reach HP phone support to order the recovery media. You can check if the recovery media is available online on by entering the exact model no. The only other way to install Windows would be to order the recovery media for your laptop and using the recovery media you can install Windows. So, please remember to back up your data before initiating system recovery. If nothing works, I would suggest you perform a system recovery using the partition available on your PC. Doing this will wipe off everything and set the computer back to the original factory conditions. (The above link is 3rd party and is not owned by HP, I've posted this only so that I may help you resolve this issue by going beyond by support boundaries, please ignore the ads and take only the free suggestions) Next, Try using the VLC media player (free download available here) or any other media player of your choice apart from the one currently in use and let me know if there's a difference. Later please download and install the drivers from this link for the audio: I suggest you update both your video card and the sound card from the Official HP websites for Software and drivers: Click here.Right click on each option inside it and select uninstall. Expand Sound, video and game controllers.In Windows, search for and open Device Manager. If the audio and video are still not in sync then let us uninstall and reinstall the audio drivers by following the below steps.

If this issue started recently then please perform a Microsoft System Restore to rollback the laptop to a previous date when everything worked as expected.

Meanwhile, I recommend you to perform the below steps to isolate and fix the issue:

Did any updates or software changes take place after which this issue may have started?.

When was the last time the audio and video were in sync?.

I would like to know some information to assist you better: I came across your post and would like to help you. I read that you have an HP 15 notebook and while playing videos from DVDs, Netflix, Youtube, Facebook Live, iTunes movies, etc. Hi for posting on the HP Support Forums page.

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Youtube audio out of sync windows 10