Getting Lots Of Unknown Emails

I have an email account and only I know the password and account is not compromised as far as I know. I have changed the password also, a few days ago. But I am receiving lots of emails, saying they removed me from mailing list. Are these just jokes or is the PC infected with some kind of a virus. I have some important mails in my account, related to banking also and don't want anyone to get access to those mails. I cannot delete my email id because its associated with my bank and some sites too. What do I do next? I have been receiving lots of mails and its creating a problem for me to read important mail. I don't have any mail client installed on my computer also. Tell me how to stop these large number of mails.
