What it's about: en.wikipedia.org/wiki/Wilczyca

An early 1980s period horror film made while the commies were still in power. A nobleman in 19th-century Austrian Poland suspects his dead wife has been resurrected as a wolf.

There are no actual transformations though, so don't waste your time looking for one. But it's a pretty decent horror flick otherwise.

Link to the full film, with English subs:

http://www.youtube.com/watch?v=QOmgWPtW0pY