Yes I did, and I responded :-)
What browser are you using? If it's Firefox:
Tools>Options>Privacy
Then click the tab marked 'show cookies', scroll down for the Answerbank cookie then select it and click the tab marked 'remove cookie'.
Note that when you next go to AB, you'll have to re-enter your username/password.
That said, you might be better off deleting ALL of your cookies, but bear in mind, this means you will have to log back into everything you use that has a username/password setup.
Make sure your anti-virus software is up to date and run a full scan.