Flash Player Error: Choose device to replace

I have recently brought a new laptop and then had to replace it. I went to my usual movie streaming site Bigpond Movies which does not require login to view trailers and I receive an error message just a video clip was loading saying Choose device to replace. The message box text reads "you have reached the limit of registered devices. To watch movies or tv shows you must replace one of your existing devices. You can replace one device per month. No options in box except cancel. Any help with this would be appreciated immensely.