Fix Genshin Impact 9999 Error Code on Windows 10/8/7 PC (3/25/2023 updated)

3/25/2023 added:
1. Reinstall the game. The error code 9999 usually occurs when there is a corrupted file in the game installation. Reinstalling the game will fix this issue.
2. Update the game's launcher. The error code 9999 can also occur if the game's launcher is outdated. Updating the game's launcher will fix this issue.

If you are still having trouble, you can contact Genshin Impact support for further assistance.