How to Secure VBulleting 3.8.5

[Ashfaq]

Hi,

Just installed vbulletin and want to secure my forum from hacks. So far i did these steps

1. Renamed AdminCP and ModCP
2. Uploaded Robots.txt file in hosting directory

User-agent: *
Disallow: /admincp/
Disallow: /arcade/
Disallow: /archive/
Disallow: /cgi-bin/
Disallow: /clientscript/
Disallow: /cpstyles/
Disallow: /customavatars/
Disallow: /customgroupicons/
Disallow: /customprofilepics/
Disallow: /images/
Disallow: /includes/
Disallow: /modcp/
Disallow: /packages/
Disallow: /signaturepics/
Disallow: /vb/
Disallow: /ajax.php
Disallow: /album.php
Disallow: /announcement.php
Disallow: /asset.php
Disallow: /assetmanage.php
Disallow: /attachment.php
Disallow: /attachment_inlinemod.php
Disallow: /blog_ajax.php
Disallow: /blog_external.php
Disallow: /blog_inlinemod.php
Disallow: /blog_report.php
Disallow: /blog_search.php
Disallow: /blog_subscription.php
Disallow: /blog_usercp.php
Disallow: /calendar.php
Disallow: /clear.gif
Disallow: /converse.php
Disallow: /cron.php
Disallow: /editor.php
Disallow: /editpost.php
Disallow: /external.php
Disallow: /faq.php
Disallow: /global.php
Disallow: /group_inlinemod.php
Disallow: /groupsubscription.php
Disallow: /image.php
Disallow: /infraction.php
Disallow: /inlinemod.php
Disallow: /joinrequests.php
Disallow: /list.php
Disallow: /login.php
Disallow: /member.php
Disallow: /memberlist.php
Disallow: /misc.php
Disallow: /moderation.php
Disallow: /moderator.php
Disallow: /newattachment.php
Disallow: /newreply.php
Disallow: /newthread.php
Disallow: /online.php
Disallow: /payment_gateway.php
Disallow: /payments.php
Disallow: /picture.php
Disallow: /picture_inlinemod.php
Disallow: /picturecomment.php
Disallow: /posthistory.php
Disallow: /postings.php
Disallow: /printthread.php
Disallow: /private.php
Disallow: /profile.php
Disallow: /register.php
Disallow: /report.php
Disallow: /reputation.php
Disallow: /search.php
Disallow: /sendmessage.php
Disallow: /sendtofriend.php
Disallow: /showgroups.php
Disallow: /showpost.php
Disallow: /subscription.php
Disallow: /threadrate.php
Disallow: /threadtag.php
Disallow: /usercp.php
Disallow: /usernote.php
Disallow: /visitormessage.php
Disallow: /widget.php

3. Blocked "&#" in censorship options.

4. Added Questions and Answer to Registration to prevent spam registrations.

Please let me know any other options that needs to be done to prevent my forum from getting hacked.