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There are viruses sophisticated enough to infect the entire computer from a non-administrator account; however, if you keep your computer up to date with Windows Update and always download the signatures for your Anti-Virus software vulnerabilities in your computer will be closed and the virus cannot damage the system.
You wouldn't hand out a key that could open everything in your house to anyone who asked, so why would you hand out administrative account to anyone?
They require writing files to certain directories, and registry keys, that "normal" user do not have access too.
These programs are often hidden within webpages, IM chat windows, word processing documents, and e-mails.
Malware is a class of software, which usually does harm to a computer, and is unwanted on the computer by its owner.
Malware includes viruses, spyware, adware, and trojan horses.
If a person has physical access to the computer, there are a few measures that can be taken to prevent damage to the computer.Next, make it so a user needs a password to change the BIOS settings, this prevents someone from changing the boot order and thus booting from a CD-ROM or floppy disk drive.Last, put a lock on the computer case preventing someone from opening the computer case and resetting the jumper on the motherboard that clears the BIOS boot password.First, change the settings in your computers BIOS so that it boots first to the hard drive.Booting from the hard drive first ensures that a person cannot boot from a bootable media such as a CD-ROM or floppy disk.