Here's what u do
Go to start in windows
Type in %appdata%
Look for roaming/Axiom
Click it
Takes u to folder page.  Click on Axiom file
Up comes all files for Axiom.qt, delete all files except your wallet.dat file
Start wallet again

Notes:  make sure wallet is closed when u start this process, also make sure u have stored your wallet.dat file somewhere.  Backing up your wallet should be fine.

Hope this helps