Lost my lightroom photos as Lightroom opens up an empty catalog after reinstalling Windows OS

If you were using Lightroom then your photos are safely stored in the cloud. You should see them when you sign into your account. If you were using Lightroom Classic your photos were on a local hard drive, not inside of Lightroom. If you didn't understand this, and didn't pay attention to where your photos copied to when imported, they were in the Pictures folder. They may still be in the Pictures folder depending on how you reinstalled Windows.

Hi there,

Sorry that Lightroom is no longer showing your images after you;ve reinstalled Windows 10 on your computer.

Which version of Lightroom are you using? Lightroom desktop or Lighroom Classic?

Reinstalling Windows 10 should also reimage all the files/folders. Lightroom catalog is saved in the Pictures folder by default. Do you have access to the original catalog or backups of your Lightroom catalog stored on an external device? 

You may checkout the steps mentioned in this article https://helpx.adobe.com/lightroom-classic/kb/recover-catalog-images-resetting-lightroom.html#id_41746 and let is know if that helps.

Thanks,

Akash