I used a program called "program locker" to "hide" or decrypt files.
That doesn't make any sense. "Hiding" is the same as "encrypting" - not decrypting.
When you have some data, using a secret key (which you presumably have), you can encrypt the data so that no one can access it without decrypting it first.
If you encrypt it, but forget your password, assuming you use a "good algorithm", there is little chance of you getting the data back "IF your secret key is long". If your secret key is not long, you might be able to brute force the key to decrypt the data.
Provide more details?