MSU - install problems

[Apoc_Ze]

Im pretty advanced at this stuff, but i usally never reg at forums websites. I have this question, ok when i goto install MSU its telling me "The Installion Package could not be opened. Verify the package exists and that u can access it, or contact the application vender to verify this is a valid Windows Package." ........... I bypass it and got around it without installing it but has anyone else had this problem and know how to fix it