OK, here's a remover script for any stragglers that Avast found but F-prot didn't.
I get the impression that the syssvc.exe was the key foot-in-the-door that had your computer strangled. Just removing that will likely be sufficient to unlock Windows, but we're going to be thorough about this.
One thing I did out of curiosity is that this second script (run like the first: rename, right-click, window > terminal here, sh remove2.sh ) doesn't delete things, except for the contents of 2 temporary file repositories that should definitely be emptied under the circumstances. The rest it moves to a safe location so we can see if it did, in fact, find anything.
I look forward to the second scan logfile.