To remove the StartupCheckLibrary.dll error, first download Autoruns:
https://live.sysinternals.com/Autoruns.exe
- Run Autoruns.exe as administrator.
- In the Filterbox up top Enter: startupcheck
- You should see a Task Scheduler entry:\Microsoft\Windows\Application Experience\StartupCheckLibrary
- Right click on this entry and Delete.
...and that's the end of the error.
BTW Ignore any advice that recommends restoring this dll from quarantine. It's a CoinMiner and you really don't want it!