I don't know if this will help you but first I would say yes you need to reinstall LW on your computer but for the License Acquisition issue, I have noticed occasionally I will download a file and when I attempt to play it I will get a message saying I need a liscense to view this file. I clicked yes one time to see what would happen and IE started up with multiple windows and all of them were to porn sites. I tried closing the windows but they were opening up so fast I could not get them all closed. So I used the task manager to completely shut down IE. After that happened I have never tried to get the license when I am prompted to. I would say that alot of these porn sites hide their files as other names to get unsuspecting people to access their websites. I did download a different media player that will play these files without asking to get a license and when I use that player all I get is a scrambled video. I can only assume that these files are all from porn sites so I no longer even attempt to access them.
I also do not open any files that have a .exe extension.