System Check program belongs to the category of fake hard drive defragmenters. This malware sample represents itself as some system optimization tool allegedly able to repair thousands of bugs, errors and problems it reports. But, in fact, it is personally the source of many problems. One of the most serious and disappointing amendments initiated by this hoax is hiding the files on your computer. The malware sets up the hidden attribute to all your personal data, shortcuts, icons, quick launch items. It even hides the list of programs in the Start menu. This would result in the entire desktop of your computer being totally black or blank (gone). Users would not actually see any other icons except for the ones having to do with System Check virus.