Surprised that these NDIS Filter drivers were not removed using aswclear.exe when running Win 7 here. Made a point of doing a clean install before moving up a build number from 8.0 to 9.0 just to hopefully prevent such an issue.
But, having said that, this has not really been an issue since the initial post here. Ultimately, this could resolve out as a memory leak issue with Statistics window as that could cause a breakpoint where it just stops running properly. We'll just have to wait to see if that is the case. Of note, this breakpoint did not affect proper operation of avast! as a whole, as far as I could determine. Nothing was amiss in any Administrative Tools logs that I could find for either avast! or the Statistics window.
[EDIT:] Removed erroneous statement.