If you have accidetally submitted three times, there is always a delete button on the top right corner of the post. No, dont try to do that now. No use. Try next time.
OK, back to your query, The prime reason for not having an antivirus is that GNU/Linux is usually a very secure box, and a little virus exist for the same.
Regarding install, you have to format a drive for installing gnu/linux. So back up your data on D drive to say, C, as you have no burner, and allocate D drive [/dev/hdx5 in gnu/linux terminology - where x can be a,b,c or d] for gnu/linux.
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Sometime you'll think you understand everything
...Then you'll regain consciousness
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