Google doesn't show up anything for KHTFPAC although kht is a recognised family of Trojans (possibly Ransomware).
Did you spell KHTFPAC correctly?
Be nice to know what it's trying to do (which exact variant) before running scanners.
Any other unusual pop-ups, Installed programs.
See Control Panel Uninstall a program
Also press Windows key+R and type services.msc Look if you can spot anything with strange names
Also (if it is Ransomware), your docs may have been encrypted.