You may have MS Silverlight installed, or you didn't install it correctly. Got into your system Control Panel, find and click on the icon, "Programs and Features" and uninstall Silverlight completely. Next, make 100% certain that you have the newest version of Silverlight, from the Microsoft Download site, redownload that file, then reinstall Silverlight. After a quick restart/reboot (warm boot), see if it works without the error message. If not...
Download (again, if need be) the very latest version of whatever program your using for your "slide show." Uninstall the installed version, follow above instructions (i.e., check for leftovers wherever you may have installed the "slide show" utility, delete them and remove the folder, reinstall, reboot; see if that works, now.
Good luck! :o