Error which can occur when installing Magento:

There has been an error processing your request
Exception printing is disabled by default for security reasons.
Error log record number: XXXXXXXXXXXXXXX

Here is the solution:

Navigate to the "errors" folder.

Change local.xml.sample to local.xml

You should now see a new list of crazy errors all over the Magento page - this is okay.

Open magento/lib/Zend/Cache/Backend/File.php and look for:

protected $_options = array(
'cache_dir' => 'null',

Change it to:

protected $_options = array(
'cache_dir' => 'tmp/',

Save it.

Now the final step is to go create a tmp folder in the root Magento folder. Done!