Well here's 0.9.1 the latest for windows:
https://bitshares.org/binaries/BitShares-v0.9.1.exe Make sure you backup your wallet to a json file first (use the menu at the top to do the backup)
Copy that json file to a secure location and usb stick if possible.
Copy your /wallets folder to the stick too, just for safe keeping.
Extract 0.9.1 and install it. Allow it to upgrade everything.
Run the new version (it should pull up your wallet just fine).
Give it 5 hours to download and fully resync the blockchain.
I'm not a windows guy anymore, so if any of this is wrong, one of the Devs will correct me, but this safeguards your wallet most importantly.
I have paged a couple Devs too, so they can see my post here and verify...