Which version of the wallet are you now running??
1.4.1 or 2.0.0??
And are you on Mac or Windows.
It is not clear from your previous but your comments seem to indicate now on OSx
The easiest way is to open a Terminal
I will try and step you through
Firstly shut down your wallet, as the following steps will relaunch it
Next we are going to get to the Terminal to include the -salvagewallet option
Start by opening the Terminal from the Applications/Utilities folder
This should upon in your home directory
We now need to switch to the installation path of Reddcoin-QT
In the Terminal type
This should place you into the Install directory
Now, make sure you have a backup of your wallet.dat for safety
We will now launch Reddcoin with the salvagewallet option
At the prompt type:
and hit enter
This will have opened your wallet, and attempted to salvage the recoverable keys.
Please let me know if successful
Alsohis is not failsafe, but is a good first step
So if you have problems there are other more technical ways to tackle help solve