The first thing you can do is to update to the latest DAT version and do a full scan and see if it resolves the issue.
Also try submitting any suspicious files you think are present in your system and do not enter any password/credit card numbers as these might be password stealers.
You can find detailed instructions for how to submit a sample/file at <http://vil.mcafeesecurity.com/vil/submit-sample.aspx>
(non technical tip)
One more thought, just ask your bank officials if by any chance they have blocked it for any particular reason. (Although this might not be the case).