Result - Error: Access is denied (5)

My laptop has been running horrendously slowly for a while now, I have completely rebooted it and restored it to factory default settings. However, this has not solved the issues. After running a scan on Avast two threats were detected. One was successfully moved to chest, great, but the other will not respond to any of the potential fixes. Move to chest, repair, delete, nothing works. The file name is c:/windows/system32/autochk.exe, it’s severity is high it’s status is Threat: Win32:Malware-gen

Any help in removing this (if needed) would be great as my laptop isn’t particularly old (2 years) and is performing horribly.

Thanks

follow instructions https://forum.avast.com/index.php?topic=53253.0
attach Malwarebytes / Farbar Recovery Scan Tool logs