Setup Has Detected Previous Versions Of SharePoint – SharePoint 2013

But there are no versions on the machine you are using?

Lots of folks have been pinging me about this on freshy Windows Server 2008 R2 machines, using the eval copy that was released for testing a few days ago for SharePoint 2013 preview. I was able to replicate the problem, and there is a way to get around it. Don’t use the links on PSConfig, they all still point to 2010 material :)

Long story short, few things to check.

  1. Is there adequate disk space?
  2. Have you installed SP1 for Windows Server 2008?
  3. Confirm that all pre-reqs have run successfully.

All that look good? It’s in all probability actually not a freshy machine and there are still some files left over a 2010 installation. Check this registry path:

HKLM\Software\Microsoft\Shared Tools\Web Server Extensions\14.0

Delete all the folders under it, then try the installation again.