Are files in C:\Windows\System32\wdi malware?

[jmt356]

Avast has indicated in a full scan that "some files could not be scanned." The files, called snapshot.etl, are all located in C:\Windows\System32\wdi. I am receiving is "The system cannot find the path specified," but there are another 15 or 20 of them in other folders.
I am wondering if those files are malware and whether I should just delete the C:\Windows\System32\wdi folder.
I am seeing mixed info. on the internet, some of which raise red flags, but some posts at http://forum.avast.com/index.php?topic=127665.0" onclick="window.open(this.href);return false; indicate that snapshot.etl is nothing to worry about.

[HansV]

Nah, they're system files created by Windows. Leave this folder alone.