System Check Virus manual removal guide:

Delete System Check files: (Learn ho to remove System Check virus files here. )

%CommonAppData%\[random]
%CommonAppData%\[random].exe
%DesktopDir%\System Check.lnk
%Programs%\System Check\System Check.lnk
%Programs%\System Check\Uninstall System Check.lnk

Delete System Check registry entries: (Learn how to remove System Check malware registry entries here.)

HKEY_CURRENT_USER\Software\MicrosoftInternet ExplorerMain
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings