ieproxy.dll is usually located in the 'c:\Windows\WinSxS\Temp\InFlight\23514c1415a1d301640500003c39e416\x86_microsoft-windows-ie-ieproxy_31bf3856ad364e35_11.0.16299.125_none_856ab70e265fb9e2\' folder. If you have additional information about the file, please share it with the FreeFixer us...