I’m using Windows 8 and don’t have those files on the root C:\ drive.
I suggest that you rename those files. once done, reboot your system and make sure avast is still runing
without any problems.
If that’s the case, you can remove those now renamed files. If not, restore the original names, reboot and see if everything
is back to normal.
I think they are probably files that didn’t get cleaned up after an install.