The good portable antivirus programs come with a bootable Operating System so that you can actually boot your PC off of the thumb drive (this means that the computer is booted without using its own boot system files which could possibly be infected by the virus), use the antivirus firewall software to detect the virus, clean the virus off the computer, and then allow the system to boot normally off of its own hard disk. These advanced and cleverly written antivirus and firewall software programs can also come with a network activity monitor. This is such a nice feature to use when you are trying to troubleshoot what is wrong with a virus infected computer. The network activity monitor acts as a portable firewall and can tell you what kind of traffic is coming in and out of your computer as well as tell you how much traffic is going to what location. When you are searching for free portable software, I would look for a vendor who has created a bootable USB option and a network activity monitor that integrates with the free antivirus program. The two movable antivirus programs that we recommend are Portable ClamWin and MicroWorld Free Antivirus.

Almost all computer technicians these days carry some kind of transferable device that uses antivirus firewall software to rid PCs of even the worst worm or virus. Even if you are a normal home computer user, go ahead and get yourself some antivirus and firewall software that can run on a transportable device. Someday you will be thankful that you have your own portable antivirus.

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Virus:
Antivirus and firewall software is designed to work together in combating multiple security threats; the first of which is called a computer virus.  A computer virus is a small program written to attach itself to a legit program that is running on your computer.  For example the virus could piggyback onto your web browser, so that when your web browser is started the virus is activated as well.  Once this malicious piece of software is started it can reproduce itself by attaching to other programs causing all kinds of issues.  This is why antivirus firewall software is so critical to the longevity of each computer system.

Email Virus:
Another common virus is the email virus.  An email virus propagates by attaching to an email message that is sent and then emailing itself out to every email address that was present on the address book of the infected computer.  This type of virus software can replicate very quickly, can be damaging to each computer it affects, and can cause major issues to corporate email servers and infrastructure.

Trojan Horse:
A Trojan horse virus is a tricky piece of software that is based off, according to Greek mythology, of the gigantic, hollow wooden horse that was constructed by the Greeks to import their fighting men into the city of Troy under the guise of a gift of peace.  This Trojan software claims to be a certain program (like a game) but instead becomes a vicious virus when it is executed.

Worms:
A worm is an intelligent piece of code that replicates itself via computer networks and various security holes.  It finds its way into a computer and then uses its network connectivity to move from one computer to the next.  Worms are very hard to detect because they often do not stay in one place for too long.

These are just a few examples of what antivirus and firewall software are capable of fighting against.  This software is often called Internet Security Software and can be found as antivirus free software:
This combination is a great one-two punch that can knockout most types of viruses and malicious hackers; the power is in the antivirus firewall software.

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