[zappsan]

You think Google search produces this error? Maybe this could be the case, if people are trying to access tags on your site by using yourdomain.com/tags/sometag. If you would have everything removed from the Zoints tags system, you'd get a 404 error, but since some files are still there, it's trying to make use of the tag system (which has been partially removed) and so you get the error.
I suggest you delete the Zoints tags folder and redirect yourdomain.com/tags/sometag to the vB tag system format which is yourdomain.com/tags.php?tag=sometag so people won't get a 404 error when they try to access your page by using the old tag link.
I hope you understand what you mean.