Quote from: johnwoo on July 29, 2014, 04:24:54 PM

Ok, thank you. I did not backup my wallet, unfortunately. But I have not deleted. I do not know how to find my wallet in files on my computer. Before, when I wanted to access my wallet, it was enough to open the application. And now it does not want to open. There an hour before re-index blocks on the disk, the latest transactions in the old wallet will be displayed. I do not know how to make a backup now that I no longer have access to the previous bitcoin-0.8.3-win32 setup?

In Bitcoin core you can backup the wallet from file->backupwallet.
I would do that first and save it to a usb stick.