It would also be helpful if you would let us know which browser you are using at the time as I believe this error is browser specific. Internet Explorer? If so which version? Internet Explorer 7 or 8 or an older one? If you aren't sure, open Internet Explorer, click on Help
then About Internet Explorer
If it only happens on certain websites, then tell us what site that is.
When you do start your own topic, please post back here with a link so we know where you are and can help you there. If you aren't familiar with forums either, you might want to browse in New User Orientation
If you have any problems at all, it is OK to post back to this thread until we get you straightened out.