I recently had a hard drive failure on a relatively new Dell. They sent me an "imaged" replacement. Problem is I cannot tell if it is 8 or 8.1. One of the websites I visited suggested that if your OS is all updated, visiting the "store" will offer you the upgrade to 8.1. No such offering. Is there a simple way to determine if you have 8 or 8.1? When I go into "CONTROL PANEL>SYSTEM" I only see under OS "Windows 8".