Last night after running a full scan with Windows Defender the following message box came up:

C:WindowsWinSxSwow64_microsoft-windows-i..micronverter-enduser and then a lot of letters and numbers ending with html.iec

Below it stated to send the page to help microsoft to determine if item is malicious. I sent the page.

Could someone please tell me what this is? I ran Windows Defender again and the box did not come up.  Could it be some kind of virus???