BTW I'm not having a go at people who do this without realising, but hopefully if anyone is in any doubt they'll click that link and realise.
For the record, it's not worth forwarding any emails to anyone about:-
- Viruses (because if you do that for one then you could arguably spend your life doing that for all the thousands of viruses out there!)
- Chain mails that give you prizes or rewards (all false promises)
- Things you should do for a good cause (Again, there are so many good causes out there, you could spend your life emailing people asking them to donate to good causes and in the end you'd not actually achieve anything other than generate excess bandwidth)
- Things you should do to petition - even if the petition will be listened to (many wont), forwarding emails wont help.
As for viruses, all you need to is install all patches/updates for all software you use and have up-to-date virus checkers.
Also it's important not to get involved in chain emails as you are forwarding your own, and others, email addresses to potentially thousands of people, some of whom will harvest email addresses to send yet more spam and junk to.
I hope that helps explain a few things!