Have you manually gone to Windows Update and ensured you have installed all of the Windows AND Microsoft updates, including the Hidden Updates that don't install automatically?
Have you ensured you have the latest version of Quicktime from Apple.com?
Some of this may be for Premiere Pro, but SHOULD also help with Premiere Elements
Also http://www.microsoft.com/en-us/download/details.aspx?id=14632 for a link to Microsoft download
Also search http://search.microsoft.com/search.aspx?mkt=en-US&setlang=en-US for Microsoft help articles