How about TimeVault or the Microsoft version of that? Got that running?
It sounds to me that OP only ever set one password for this wallet, and forgot it... if so, that wouldn't help...
(Also for the most part the Windows "previous versions" feature only works for documents if you've set up Backups, which isn't all that common....)
And now for a somewhat on-topic shameless self-promotion:
btcrecover (a password recovery tool) supports Armory, and has some advantages (and disadvantages) compared to the script supplied with Armory (faster, more flexible, harder to use), although it's not any more useful in this case, sorry....
edit:You're not going to believe it, but after days and days i remembered it! It just came to me! I've immediately created a paper back up!
![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
That's great! You can just ignore all the rest above
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)