Your backed up wallet has no password, right?
Copy your newer wallet.dat (not the backup) somewhere else and put a copy (yes a copy) of your original wallet.dat back in your %APPDATA% reddcoin folder.
We don’t need anything fancy here, just as I posted before, in most cases
-salvagewallet works a treat.
Putting your original wallet into the
D:\wherever\wallet.dat is sufficient.
Reddcoin-qt.exe -choosedatadir=1 and that should prompt (after a few seconds on startup) you to choose where your data is stored. Copy your entire %APPDATA% directory to a new location and drop your backed up
wallet.dat in there over the new one that Reddcoind keeps creating.
After you choose where you put everything, it should load. Let me know.
Don't mind my signature, there's probably more important info in the text above it.