After you apply the Windows 7 kb2803821 or XP kb2834904 upgrade, WMV files imported into Adobe Premiere Pro, Adobe Premiere Elements, or After Effects look damaged onscreen. For example, they appear as a half-frame video on import.
Likewise, any videos exported out of these products as WMV files appear corrupted.
These two Windows updates cause the issue. Microsoft has addressed this issue in a knowledgebase article - http://support.microsoft.com/kb/2803821
Microsoft has released a new version of this update that resolves the issue. Directions on how to install this version can be found here - https://technet.microsoft.com/en-us/security/bulletin/ms13-057