Rogue programs like Windows Functionality Checker is usually hard to remove especially in manual removal way. It is not surprised to see that the program comes back after you manually end its process and delete its files, as any remaining part could reinstall the fake antivirus quickly. Furthermore, computer with security flaw is easy to get infected by Windows Functionality Checker or other malware. It is urgent to get rid of Windows Functionality Checker as soon as possible and necessary to get rid of all rogue programs completely.




