Hardware and performance

Sure, Remove the eAccelerator from the php.ini and restart XAMPP. Make sure it starts up correctly and you can login.

After which you can now go and install APC, here is one for XAMPP,

http://www.devskills.com/2011/10/how-to-install-php-apc-xampp-windows.html

You can also install the Moodle APC Plugin to make use of all the other cache's

https://moodle.org/plugins/view.php?plugin=cachestore_apc

JASON

If this is a 'production' server you should not be using XAMPP. It's only designed (and configured) for development and testing. It's highly likely to give you problems under load. 

Yes, I can help if you cannot get the below to work, just shoot me a message with your email address and phone number and a good time to reach you.

Open your php.ini that is in the xammp package under \XAMMP\php\ and add a ; right before extension=eaccelerator.dll so it looks like

;extension=eaccelerator.dll

This will disable it and then you can restart XAMPP. After which go ahead and login and make sure everything is working. If it running fine without a cache since you have a small number of users just leave it alone.

Also, since you are on Server 2008 r2 , the best route is to use IIS/PHP/MYSQL installed locally and not through XAMMP,

Thanks,

Jason