If you downloaded the SharePoint 2013 Customer Preview and tried to install as a Standalone deployment, you are probably having issues.  Here's the error we're seeing...

ErrorCode:SubStatus: Service running under Network Service account in workgroup environment is not supported.

This is caused by AppFabric's Distributed Caching and can be avoided by running the PSCONFIG utility with a specific switch.  Here's how to do it...
<ul>
	<li>Open PowerShell as Administrator</li>
	<li>Type the following to change the directory...
cd 'C:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\BIN'</li>
	<li> Type the following to setup your farm...
.\PSCONFIG.EXE -cmd Configdb create SkipRegisterAsDistributedCacheHost</li>
	<li>Additionally, you will need to download and install the SQL 2008R2 or 2012 Management Studio Tools.  Once downloaded, install and open, then do the following...</li>
	<li>Connect to the local .\SHAREPOINT instance</li>
	<li>Expand Security &gt; Logins and go to the properties for the user you are using to install SharePoint</li>
	<li>Go to Server Roles and make sure the following are checked...
<ul>
	<li>setupadmin</li>
	<li>sysadmin</li>
	<li>serveradmin</li>
	<li>dbcreator</li>
</ul>
</li>
	<li>Click OK and retry running the Configuration Wizard.</li>
</ul>
You may still this error...

<em>The SDDL string contains an invalid sid or a sid that cannot be translated. Parameter name: sddlForm</em>

However, Central Administration still works.  Load it up and check it out!