virus help please! E-mail been compromised?

[Gepetto]

Hi guys. I'm after a little help with a virus issue, and, as I'm fairly close to clueless, a little advice would be very welcome.

I opened a USPS scam e-mail and clicked on Run just as my mind realised it shouldn't say Run! Doh! Anyway, I then ran malwarebytes and AVG (full version) and Malwarebytes found a couple of issues that were resolved. AVG found nothing.

Then Google e-mailed to say they had prevented a suspicious login and advised me to change my passwords, so I bought a copy of Norton, took AVG off and ran Norton. This found and resolved two viruses, Trojans, according to Norton. I changed my e-mail passwords and have had no further issues, but this morning, on one of my e-mails (I have quite a few on Outlook) came up with over a hundred "Mail Delivery Failed" messages! The e-mail addy that the messages say sent the spam has not been changed as yet.

I've been running Norton daily since my idiotic error, and have not found anything. I am slightly concerned that changing all my passwords might not be enough but I'm not in a position to just ditch the HDD and re-install Windows.

How can I be absolutely sure my machine is clear? Any advice would be truly welcome!

 

[Gepetto]

Did you change your email password on the infected machine? Are you sure that email was from google?

Before doing anything else I would borrow a clean PC and change your password on every site that you use the same password (which really should be no other sites! Reusing passwords is always a big no-no)

Hi there. Yes I did change the passwords from the infected machine, but only after Norton, and Malwarebytes, came up clear. This now worries me, as I had thought I'd eradicated the problem.

My GMail passwords were changed on an independent computer but all the business e-mails, through Namesco, were changed on this machine. Each e-mail has its own password, except for the three through Namesco.

Namesco blocked my accounts this morning and asked me to run AV and then change my passwords which I have now done, but, that is what I did last week!

Thanks llamadal, I've read through the link and done everything again.