Pretty sure just using the 8.1 will undo all changes that NukeSentinel would need to load. Mainly, make sure there is no calls in mainfile.php to load NukeSentinel (8.1 default should not have any)
Looks like someone tried to put their Google Analytics code all over your pages. You'll need to go through your server access logs to determine how this guy got in
Good luck. There are significant changes from anyone moving from 6.x and earlier... even from early 7.x. New admin model, new advertising module, phpBB2 built in, etc.
I'm looking for old Patched releases for my code archives, esp before 3.0
If you have some, give me a PM and I will give you my email address to sent to
There should be a Patched copyright in your mainfile.php
Newer Patched versions will include a version number in config.php - make sure you are up-to-date with the latest version, as there are many s ...