Trying to install a Silverlight Update, a Java update or other software, I get this window:
What could be the problem?
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A few things you should take a look at.
Make sure you have full administrative priviledges on the computer, and make sure you start the installer as administrator. (To make sure, right-click on the icon, and choose "Run as Administrator.")
Make sure you download and run the installer for YOUR user folder or from a network share that you have full administrative rights to.
If none of this works, go to your start menu and type in: "Disk Cleanup" start the program and select the "Temporary Files" checkbox and start the process. This may help to delete some failed install that you have living on your system and causing the error.
Try repairing your file and registry permissions with SubInACL.