If this is a secondary account then you can change the password via your primary login. Once you have changed it you will need to enter the new password in the email accounts settings section for the secondary account when you enter the VM webmail page.
Sign in to My Virgin Media, go to My Profile and/or Manage Accounts depending on whether the account concerned is your primary account or an additional one. Select the account concerned and then click on Change to the right of password if a primary account or View/Change then change to the right of password for secondary accounts.
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Welcome back to our Community Forums! Thank you for reaching our to us about your email issue, and I'm sorry to hear that you're experiencing this. I completely understand how frustrating this must be.
Can you keep us updated on how you're getting on with the suggestion @Graham_A provided?
Has this helped your access to your email account? If not, please let us know and we'll be more than happy to help look into this for you further.