Recovering Folders locked by any other Software

Hi,
Yesterday I moved some of the data in my desktop to my USB Hard Disk. After that I used Instant Lock v2.5 to lock it. The software was shareware and it got expired after I locked my folders.
Now my external Hard Disk is showing me that the data is there but I am not able to view my folders.
Is there a way to get my data back?

Any help is highly appreciated…….

Please help me soon….