Spam in my Inbox

Hello William.
We are sorry to hear about the inconvenience caused. Could you please let us know whether you use an email client (Outlook, Windows live mail etc.,) or login to your email account in a web browser? Thank you.

Please can someone explain to me why all of a sudden my e-mail inbox is being flooded with spam,(at least 20 in the the last 24hrs) I have not altered any of my settings except to go to optimization of my PC, which I have since changed back to standard.

Hello William,

Thank you for providing the requested information.
Unfortunately AVG program doesn't scan the web based email since those emails are not physically downloaded to your PC.
Although AVG Resident Shield will actively protect you from any malicious content entering your PC via email.
Please feel free to contact us should you need any assistance.

Via mozilla fox with AVG search, from there I use BTYahoo (btinternet.com)  hope this makes sense.