I had the exact same problem last night after I scanned.
Avast managed to delete one of the problems but left the other 2.
Well that was a mistake as it stopped all of my security programs from running.
I ended up having to do a sfc /scannow which helped.restored to a different restore point which worked.I had to go into safe mode to run System restore as it did not work in normal mode.
Rebooted and all was working ok again.
To be in the safe side ran the rest of my Security programs and Avast and nothing was found.
Switched of system restore then on again creating a new restore point cleaned out all the junk and so far everything is ok.
I will agree it looks like they are all false positives and if so caused me quite a few problems.