Most virus attachments end in the form .EXE
It may contain a harmful virus.
There are many ways to avoid getting a computer virus. One of these is to ensure the computer that is being used has working anti-virus protection. It is also sensible to never click on a link or attachment in an email that is not from a trusted source.
By using virus detection program or by not downloading or opening the attachment.
Virus protection
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You really CAN'T avoid a computer virus, but you can lower the chances of your computer getting one by installing anti-virus and anti-spyware softwares.
Attachments can contain viruses, so you may be sending a virus to someone even if you don't know it. Some e-mail systems block attachments, so your message may not get to someone if the attachment is blocked.
Most computer viruses enter a PC via a spam email or infected website. This will come the form of an email attachment or some a Java applet. This means that it can be fairly easy to avoid getting a virus. Most people will get viruses simply they were not paying attention. They will open a malicious attachment someone spends them (this likely looks like a friend) or by going to a seedy website.
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An email attachment could possibly be infected with a virus, malware, trojan, etc. Don't open an attachment from an unknown source. If you must, scan with an anti-virus program before opening the attachment.
Norton AntiVirus.