Try the fixes in the order as mentioned in the following MiniTool article.

For "Fix 2", if "unityplayer.dll" is found in your Anti-Virus' quarantine section then disable your Anti-Virus' real time protection, restore the file to its original location, add the file to your Anti-Virus' exclusion list, re-enable your Anti-Virus' real time protection and then try to run the game again to see whether the error re-occurs.

For "Fix 3", download the latest available version of "unityplayer.dll" from the DLL-Files site, extract it from the downloaded WinZip archive, move it into the installed game's folder, reboot your machine and then try to run the game again to see whether the error re-occurs.