Once a machine has been infected with some form of malware, of the most urgent steps is to disinfect that machine so it can be put back to use. Safely.
Unfortunately this is not as easy as it may well seem. There are many products out there that claim to be able to clean infections off a machine, and it turns out that they can all clean most infections off a machine, but not necessarily all. The safe option is to wipe the machine and re-install from safe media.
Of course some tools are fine for some infections, and those who are experienced in the use of such tools can safely remove some infections. But not all; the safe option is to wipe the machine and re-install from safe media.
This does assume that malware is not being written to the firmware of the computer, it’s graphics card, network card, or other device; in which case the safe option above is not safe. However infections that write themselves to firmware seem to be more in the nature of lab experiments rather than real threats today.
Further reading :-