Seed/mnemonic phrase wasn't exist on 2011.
The recovery chance is almost 0 if Windows was reinstalled several times and the PC is used regularly.
I would give up if you're going as far as using pywallet to scan the HDD directly and use magic bytes to find wallet file on your HDD. But if you haven't done any of those, you could try make a RAW copy of your HDD before do one of those.