Some nothing person has got into my email and sent an email to all my contact .I notified some of them that I can .Most would know not to open it but of those that would what would happen ? Know it not my fault as I change password quite often ,hate this sorta thing happening .
You get a mail from someone you know - probably containing a link
You click the link - the machine is infected - the malware mails the link out to everybody in your address book and so it goes on
Then it sets to work either using your machine to do other things, tries to find or intercept your credit card details if you use them on the machine or any one of a hundred other things you'd rather it didn't do.
Do you run up to date anti-virus on your machine?
If not you should install some and do a full scan.
But unfortunately it's much harder to detect malwae on a PC once it's there than to stop it getting a foothold
everywhere you email is stored it can be harvested. So you might have given it to a friend who got hacked, or someone might have sent you one of those funny circulating emails. People send them on the friends without cleaning off the previous email addys and at some point that email will hit someone whose security is weak and then the whole lot get collected by someone up to no good. They also have been known to start one off themselves with their address hidden
personally I wouldn't do anything, you have told your friends and these things run their course. If you change your addy then unless you are really tight about who you give it to, it will happen again, maybe even the day after you have changed it and its all to do again. Change your passwords, make sure that your security is tight, delete those round robin emails immediately without opening and don't send them on. Ask/tell your friends not to send them to you.