I always preview my movies before I download the entire thing, just to make sure its the right quality and so on, but it doesn't work anymore.

This happened after I installed the newest version of RealPlayer. I've tried uninstalling it and reinstalling it, but it still won't work.

Every time I try to preview a file, I get an error message saying "A general error has occured. Class not registered." Now my Windows Media Player gives the same message, too. But, they both work when I'm not trying to preview a file.

What can I do?