Note: If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem.

In this case that would include your operating system, version of WMP, name of the movia, and the source. Next, what do you mean to can't click on the movia? (Can you not double-click the icon to launch it? Not click on the link to download it? Not click on WMP while it's playing?) Finally, what error are you being presented with? (It could range from a simple missing codec to you've launched a virus on your system and are having all of your files erased.) Give us the details and we'll see if we can find a solution.