NOTHING! What does the software author say? You need to get them involved with a custom solution. Let's just take a look at what could have happened, and you will need to lean on them to help.
Your software loaded a "key". This key was used to "lock" the folders. You destroyed the "key" (by uninstalling the software!). Ther is no "key" now.
Before you decided to "LOCK" your files (I am not really sure why people do this!!!!!!!!!) with this software, did you do some research to see if they would support you with your ALL IMPORTANT files? Is there a SUPPORT LINK on the page that you downloaded the LOCKER from? ALL GOOD SOFTWARE COMES WITH SUPPORT, FREE OR NOT!!!!! Perhaps you have learned the ever present truth of, you get what you pay for!
It's kind of fun to do the impossible! -Walter Elias Disney