Apparently I'm sending viruses?

[Tumbleweed666]

As you see here you can get a file with a virus in it, usually a Windows virus. Then you send that to someone else and their PC gets infected. Usually a word document, or something downloaded from a file sharing site. Did they say, hey that last email you sent me had a virus in the attachment you sent?

Macs can become carriers for PC viruses

Not in the way you imply. They can pass on one in an email but thats very different to being a "carrier", which implies you are infected and continuously send them out. It would be a specific email and if you didnt forward that one you wouldn't be sending out any viruses.

So here's what you can do go buy something like Norton Antivirus, and know that it will slow down your system a little bit maybe. However it does catch almost all if not all of the viruses out there if you want to install it and pay yearly for it.

Pointless. If their PC has virus checking software they will trap it anyway. If they don't, they will get numerous infections anyway and your money has not made a jot of difference.

 

[AdrianK]

What email service are you using? Your password may have been compromised and they could be logging in (to the remote server, not your computer) and sending messages that way. I've had this happen to several people I know with MSN/Hotmail accounts. If this is the case, antivirus software won't help you; just pick better passwords.

Agreed, this is by far the most likely occurrence. All the talk of viruses is just unnecessary.