so it did not find anything? Just to be safe try some of the free scanners here
With Malwarebytes use the free version do not accept the free trial of the full version
I do see what you say re conflicting messages. Also download the file to www.virustotal.com and post results
Moved to Malware Discussion > Home User Assistance > Discussions
It is a recognized file and part of Microsoft's system files but there could have been some activity involving it that was out of the ordinary that caused the scanner to take an interest in it specifically.
Make sure Windows is totally up to date especially .net components and, even if you never use it, Internet Explorer. Running the scans previously suggested is a good idea anyway.