lol. I fill the same way. I don't use antivirus software anymore. They take 10% or more of my cpu at peek, when scanning a file being loaded in to memory. there is some free antivirus software like http://free.avg.com/us-en/homepage . AVG works just as good as any non free antivirus software.
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Antivirus is used because you don't want your passwords stolen by other people .The best way to prevent it is to change to Linux , For example Ubuntu and don't install anything or Use someone Thumb drive with autorun.inf
You can protect your Thumbdrive from automatic open Virus by
Step 1

creating a batch code
md autorun.inf\lpt\\

Rename it to whatever.bat
If you cannot see the extensions
Untick hide extensions for known files

Step 2 (Skip this step if you saw a autorun.inf displayed)

If it cannot create autorun.inf Protected Folder
Then open  Folder Option>View>Tick Show Hidden Files ,
Untick Hide Protected operating system files
delete autorun.inf
Then reopen the batch files ,you should be able to see a autorun.inf folder

Do not trust anyone with Thumb drive
You can't 100% confirm that his/her thumb drive has no Virus

Source(s):
google.com

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