Nothing that I can think of that would result in them being placed in the root c: folder. If any such update failed I would expect it not to have placed them anywhere or partially (one of them) in the correct folder.

If you aren’t getting any avast errors or bsod relating to the aswVmm.dll file, then could probably remove them as they wouldn’t be doing anything being in the c: root folder instead of where they would normally be, in the avast program folder…

What avast version are you using, 8.0.1489 is the latest ?
What is your operating system ?