Restore Content Types in Sharepoint Foundation 2013

If you find yourself in the situation where you've messed up with the Content Types in a Sharepoint Site Collection then this will help restore everything back to the default settings:

Open - Start - All Programs - Microsoft Sharepoint Products - Sharepoint Management Shell and run this:

stsadm -o deactivatefeature -name Fields -url http://sitecoll -force
stsadm -o activatefeature -name Fields -url http://sitecoll -force

Source: http://sharepoint.stackexchange.com/questions/8517/site-content-types-screwed-up-how-to-restore-to-default/26225#26225?newreg=0c4f241b46ab466ea0d265069efdca5f