How do you scan computer without loading an antivirus software?

You have to have some kind of software to operate a computer. For a computer to even know what to do when you power it on, there is software stored on a chip on the motherboard, called the bios. This...

Software like hardware is a vital part of the computer. You need it to do many tasks on the computer.

Just a collection of hardware circuits with no instructions as to what to do.

Antivirus software will notice about the virus,malware,spyware etc

In my prospective i think its MCAfee, or nod32 Edit: I personally despise despise McAfee. Microsoft Security Essentials is free and does a more than adequate job.