Unfortunately, no luck. Armory still crashes at the ArmoryDB.exe part. These are the last records in dbLog.txt:

-ERROR - 1480209973: (..\lmdb_wrapper.cpp:1435) Headers DB has no block at height: 0
-ERROR - 1480209973: (..\lmdb_wrapper.cpp:1415) No headers at height 0

Before the command prompt window crashed I also saw error about missing key pairs as before. The PC is really stable, I don't think that's the issue. Perhaps something is left from the old version installation somewhere still?