Usually, the hidden files that are on your computer, in the C:\ drive are used by the operating system. There are locations on your PC that are always hidden and the user isn't advised to access them. Such an example is C:\ Windows \ System32. Also, the partitions from your system, also have some temporary hidden files that contains all sort of information about the available locations on the disk an much more. If you are afraid that your computer is infected, download and use Malwarebytes. The program will scan even the hidden files and remove any threat it encounters.