Â· If one uses Norton Antivirus Software on his system, what is name of the other good Antivirus Software that may be used along with it for extra safety? If it is possible, then kindly mention any effective, completely freeware Software available for the purpose. Â· Is there any completely freeware System Cleaner Software available? Is so, website address details. Â· What is the best download Manager Software that is completely freeware? .