You are making life far harder than it needs to be. Get your asl files out of there, and put them anywhere, say on your desktop. In the Editor go to the Effects panel, click the styles section to be sure that's where you are, then click the four lined square at the upper right of the panel and choose Load Styles. That's all there is to it--no rummaging around in the program files or deleting mediadatabase. You can keep the originals wherever you like--PSE makes copies for its use when you load the styles.
Thank you so much Barbara, you are the greatest! I am new to loading these things and someone had said that it was so easy in PSE11 so thought it would be in 12. Just didnt know where to look. Thank you so very much for your help, you are amazing and so generous to share your knowledege. Cheers