Yahoo email keeps trying to send emails to the u.k.?

the virus protection stops these emails from being sent (macafee) but its saying theres 100 emails but one i have no idea what these emails are and i have no idea how to stop it

Yahoo email keeps trying to send emails to the u.k.?norton internet security 2008

Sound like this is a virus in your PC (are you using Internet explorer?). Check you have the latest anti virus software and run a full system scan. Rectify any viruses that are found.

If you are using Yahoo web mail boxes then I cannot see how

a: the web based mail would send the e-mails or

b how macafee could stop it.

So the problem is likely your PC and a virus. If you opened unsolicited mail and replied to it then that could be how it got in.