Hmmm, never used 11, but from what I thought I knew, the built in flash was not for 7?

The preinstalled version of Adobe Flash isn't supported on Internet Explorer 11 running on either Windows 7 SP1 or Windows Server 2008 R2 with SP1. However, you can still download and install the separate Adobe Flash plug-in.
Internet Explorer 11 - FAQ for IT Pros

A Guy