Go to your appdata folder (Type %appdata% in the start search box), open \Roaming folder and find Reddcoin folder, inside there you’ll find your wallet.dat files, back that file up.
Next, add a shortcut for the reddcoin program (desktop is a good place to put it).
Right click on the shortcut, where you’ll find the box called “Target”, the data inside there looks something like “C:\Program Files (x86)\Reddcoin\reddcoin-qt.exe”, now put -salvagewallet at the end of it like this “C:\Program Files (x86)\Reddcoin\reddcoin-qt.exe” -salvagewallet. now click the shortcut so that the program will start using the shortcut, it will now take some time to open it, because it is creating you some new files.
When finish, go back to you Reddcoin folder in appdata ^. where new wallet.dat file are located with a time stamp in their name, back those files up aswell.
Now you can close the program and delete everything in the reddcoin folder, and now put the bootstrap.dat file in the reddcoin folder.
Open up the reddcoin program again, this time like normal, you can delete the shortcut now btw. it will now begin loading blocks from the bootstrap file.