The .htaccess is there, I've tried uncommenting it and changing the location to '/', '/var/forums', and '/forums' but without any success. I just installed mod_rewrite on the server before this, so it's not a lack of that.
I tried enabling it (I'm running Debian, and I've been told I need to edit the file located at /etc/apache2/sites-available/default. Here's the a snippet I grabbed of my quick edit that should have allowed it
It appears to work on the home page, but as soon as I click on any forum links this pops up
Quick edit: I've also tried to find the error log file, which I've used before, but I can't remember where it is.
Got it to work! Not sure really what was the problem. All I did was change the RewriteBase (which was already at '/') to '/var/forums' and then back again. Maybe it just took a while for the AllowOverride to update?